Lawrence Grossman stands among the scholar-editors who shaped the documentary record of postwar American Judaism from inside the institutions they studied. A native New Yorker, he earned his rabbinical ordination along with BA and MHL degrees from Yeshiva University and a PhD in American history from the Graduate Center of the City University of New York. He came to the American Jewish Committee in 1982 and remained there for close to four decades, serving as director of publications and as editor of the American Jewish Year Book. His scholarship runs less toward theology than toward the anatomy of institutions. He reads American Judaism through schools, leadership networks, demographic shifts, philanthropic patterns, and the ideological quarrels that organized communal life produces.
At the American Jewish Committee, one of the central defense and policy bodies in organized Jewish life, Grossman worked as editor and intellectual gatekeeper during a period of communal change. The post required him to manage disputes across denominational and political lines while protecting the credibility of the organization’s publishing apparatus. He observed the transformation of American Judaism from within an influential institution. The vantage gave his writing a granular grasp of how Jewish organizations operate: how authority gets negotiated, how consensus fractures, how educational systems reproduce ideology, and how communal elites respond to social pressure.
His enduring institutional contribution came through the American Jewish Year Book, the major annual reference work of organized American Jewry for more than a century. Grossman served as primary co-editor alongside David Singer beginning in the late 1980s and later as sole editor until the American Jewish Committee ceased publication after the 2008 edition. The work extended past technical editing. He commissioned and curated the annual essays that documented demographic trends, anti-Semitism, denominational conflict, educational developments, philanthropy, Israel-Diaspora relations, and the changing political orientation of American Jews. Through these choices he shaped what entered the permanent record.
For roughly two decades he also wrote the annual review of American Jewish communal affairs. These essays became an interpretive resource for scholars of postwar American Judaism because they paired documentary care with concision. Grossman did more than catalogue events. He synthesized ideological conflicts while they still unfolded. His surveys tracked the erosion of the old mid-century non-Orthodox consensus, the rise of Orthodox institutional confidence, the disputes over patrilineal descent in Reform Judaism, the expansion and financial strain of Jewish day schools, the realignment of American Jewish politics after the Cold War, and the communal aftermath of the post-September 11 security environment. He produced, in effect, a running institutional history of American Jewry in real time. Historians often treat the essays as primary sources because they condense sprawling disputes into disciplined analytical prose.
His major scholarly work, Living in Both Worlds: Modern Orthodox Judaism in the United States, 1945–2025, gathers decades of study of Modern Orthodoxy as both religious movement and sociological formation. The title names the tension at the center of the movement: the effort to hold rigorous halakhic commitment while participating in modern secular society. Grossman treats the balance as a fragile institutional achievement that demands constant maintenance. The “both worlds” formula points at once to religion and modernity, particularism and integration, rabbinic authority and professional ambition, Jewish continuity and American upward mobility.
The book traces how Modern Orthodoxy moved from an insecure immigrant subculture in the 1940s to a prosperous, highly educated, institutionally confident sector of American Jewry by the early twenty-first century. Grossman attends to the conditions that drove this change: suburbanization, postwar economic mobility, the growth of day schools, professional-class advancement, summer camps, youth movements, synagogue networks, women’s education, Israel study programs, and above all the role of Yeshiva University as the flagship of centrist Orthodoxy. A recurring theme holds that success bred new instability. Earlier generations feared exclusion from American life. Later ones faced the reverse problem, an integration so complete that it threatened communal distinctiveness.
Grossman gives sustained attention to the “Year in Israel,” the gap year American Orthodox students spent in Israeli yeshivas and seminaries before college. He argues that this pipeline became a major channel for the rightward shift of American Orthodoxy. Students often returned with stricter commitments and sharper skepticism toward the accommodationist ethos of their parents. The result was a widening generational divide over secular education, gender roles, rabbinic authority, and engagement with the surrounding culture. He chronicles the pressure that more conservative and independent yeshivas placed on Yeshiva University, showing how centrist Orthodoxy found itself defending secular learning and professional integration against charges of compromise from the religious right. The same pressure, he shows, marginalized left-leaning Modern Orthodox initiatives, above all those that sought expanded ritual and leadership roles for women. He situates these quarrels within larger struggles over prestige, educational authority, institutional legitimacy, and generational succession rather than treating them as isolated theological controversies.
Israel holds a central place in his framework. He argues that the aftermath of the 1967 Six-Day War altered American Orthodox consciousness by turning Israel from a distant political project into a core religious and emotional reference point. Study programs, transnational rabbinic networks, and growing identification with Israeli religious culture reshaped the orientation of American Orthodoxy. The process strengthened Orthodox identity and at the same time sharpened the tension between American bourgeois integration and Israeli religious maximalism.
Grossman writes with the restraint of an editor and institutional historian. His prose is measured, documentary, and cumulative. He rarely reaches for grand theory or prophetic rhetoric. He assembles patterns from organizational reports, conference debates, educational policy, demographic data, rabbinic disputes, philanthropic trends, and communal publications. Judaism in his pages appears as a dense network of schools, journals, donors, synagogues, leadership pipelines, and competing prestige systems.
His own career reflects the change he documents. The early American Jewish Committee bore the stamp of a German-Jewish elite culture that prized assimilation, decorum, and quiet diplomacy. Grossman entered during the rise of a more ethnically assertive, religiously confident, Orthodox-inflected American Jewish world. An Orthodox Jew directing publications at a historically liberal, largely non-Orthodox defense organization, he embodied the normalization of Orthodoxy within elite American Jewish institutional life. He did not only chronicle the ascent of Modern Orthodoxy. His trajectory formed part of it.
Within American Jewish historiography he occupies a middle ground among academic historian, communal intellectual, and institutional archivist. He lacks the public profile of Jonathan Sarna or Irving Greenberg, yet his influence inside the infrastructure of American Jewish scholarship has been considerable. His contribution lies in preserving and interpreting the institutional record of postwar American Judaism with care and discipline. He documents how American Orthodoxy built schools, educational pipelines, professional networks, philanthropic systems, and family structures able to sustain religious continuity under conditions of modern American affluence. Living in Both Worlds finally reads as more than denominational history. It studies the sociological cost of successful integration, and it argues that the central challenge facing Modern Orthodoxy is no longer survival at the margins but cohesion amid prosperity, professional integration, and ideological fragmentation. The book stands as both a chronicle of a movement and a meditation on how religious communities adapt to modern liberal society without dissolving into it.
This is the American Jewish Year Book’s annual review for 1998, two chapters by two different hands. Lawrence Grossman writes “Jewish Communal Affairs.” Berel Lang writes “Jewish Culture.” The split tells you something before you read a word. One man tracks the fights. The other tracks the books, films, food, and deaths. The year looks different depending on which man you trust to narrate it.
Grossman’s chapter is the stronger piece of writing because it has a spine. The spine is a single question that runs through every section: who gets to speak for American Jewry, and what happens when nobody can. The peace-process fight, the conversion fight, the funding fight, the merger fight, the Pollard campaign. Each one is the same story. A body claims to represent the consensus. The consensus does not exist. The body fractures in public.
The Presidents Conference is the recurring character here, and Grossman is too good a reporter to editorialize, so he lets the body’s own behavior indict it. On May 6 the Conference refuses to bring a motion to a vote. Five days later it votes 27 to 3 to issue a statement. Nothing changed in those five days except the emotional temperature after the Netanyahu visit. That is the whole drama of the chapter in miniature. The organization chases opinion, and arrives late.
AIPAC is the foil. AIPAC needed four days to get 81 senators because AIPAC does not have to negotiate an internal consensus first. Grossman states this plainly and lets the contrast sit. The lobby that answers to no one moves fast. The umbrella that answers to everyone cannot move at all. The “battle of the letters” is the year’s perfect symbol, and the New York Times headline he quotes, about Jewish groups squabbling, does the work that a thousand words of analysis would not.
The conversion section is the chapter’s best sustained passage because Grossman catches the gap between Israeli pragmatism and American principle. Israelis treat the Ne’eman compromise as a face-saving fiction that lets converts get processed leniently while the chief rabbis look away. Americans treat it as either binding or fraudulent. Rabbi Joel Meyers calls it “a fraud for good purposes.” That phrase is the entire transatlantic misunderstanding compressed into five words. The Americans want the principle settled. The Israelis want the problem managed. Neither side hears the other.
Now the harder judgment. Grossman has a thumb on the scale, and it shows in his verbs and his framing. The dovish side gets the sympathetic adjectives. The hawks “exasperate” and “blunder.” Netanyahu “breaches protocol.” The evangelicals are “distrusted.” When Yoffie attacks Orthodoxy as “ghetto Judaism” and “a betrayal of America,” Grossman files it under “harsh anti-Orthodox stereotyping,” which is fair, but he gives Yoffie far more room to make his case than he gives the sectarians to make theirs. The chapter reads as a liberal communal insider’s account of a community moving right and not liking it. That is honest as far as it goes. A reader should know the angle.
Lang’s culture chapter is the weaker piece, and the weakness is structural. It has no spine. It has a gesture toward one, the idea that American Jewish culture lives on the seam between high and popular forms, but he announces this thesis and then abandons it for a catalogue. The chapter becomes a list with connective tissue. Books published, plays staged, conferences held, people died. The prose is more ornate than Grossman’s and says less. Where Grossman shows you a fight and lets you draw the conclusion, Lang tells you that something is “significant” or “compelling” and moves on.
The one real idea in Lang’s chapter is the memoir observation, and it is a good one. He notices a flood of personal history writing, Wieseltier’s Kaddish, the Dubner and Bechhofer identity-discovery narratives, Roth’s I Married a Communist, and he asks why. His answer is that anxiety about the future drives people back to the self as the one subject they own. He writes that the books matter less for the writing than for the readership they attract, which is a sharp sociological move, treating the bestseller list as evidence about readers rather than authors. He should have built the whole chapter on that and cut two-thirds of the catalogue.
The two chapters share a buried subject neither names. Both are about a community that fears it is dissolving. Grossman’s fights are fights over boundaries, who is a Jew, who speaks for Jews, who funds whom. Lang’s memoirs are searches for a self that is “socially contingent.” Same anxiety, two registers. The Dershowitz title he quotes, The Vanishing American Jew, is the year’s keyword, and it sits under both chapters. The 52 percent intermarriage figure, the conversion wars, the Birthright pitch, the day-school funding fights, the “seduction not rape” line from Ruskay. The community spent 1998 fighting about Israel because fighting about Israel was easier than fighting about itself.
The chapter records the moment the modern Orthodox lose their nerve. Yeshiva University gives Ne’eman an honorary degree and hides the announcement to avoid antagonizing sectarians. Senior faculty boycott anyway. Steinhardt charges Orthodoxy with “moral self-centeredness.” The word “flipping” enters the language. That is institutional capitulation caught in real time. A movement under pressure edges toward the harder flank and calls the edging fidelity.
What would I push back on? Grossman never asks whether the Presidents Conference failure is a bug or the design working. An umbrella group that cannot reach consensus on a contested foreign policy is doing roughly what a pluralist body should do, refusing to manufacture a unity that the members do not feel. He treats the paralysis as dysfunction. It might be honesty. And Lang’s reluctance to make any judgment at all, his closing line that the deaths “say something significant about the present” without saying what, is the academic’s hedge. He has the material for an argument and declines to make one.
If you are mining this for the suppression-and-cover-up book, the cleanest thread is the Roth affair at the Holocaust Museum. A scholar is appointed, old writings surface comparing Israeli policy to Nazism, the field closes ranks behind him under Wiesel’s lead, the New York Jewish Week brands the critics with “Jewish McCarthyism,” and then two congressmen produce more quotes and the defense collapses overnight. The interesting part is how fast the protective consensus formed and how fast it broke once the cost of holding it rose. That is your story. The wall holds until the wall is expensive.
The Culture Wars and American Jews (2013)
Grossman takes a real paradox and states it without flinching: the norms the traditionalist side defends, sanctity of life, heterosexual marriage as the social standard, a Creator who orders the world, all originate in Jewish texts, yet American Jews sit overwhelmingly on the side that wants those norms kept out of public life. He then marshals thirty years of survey data, Cohen in 1981 and 2000, Pew in 2008, PRRI in 2011, to show the anomaly is stable across decades. That spine holds.
Where it goes soft is causation. He offers two explanations, the religious one (Jews are less religious, so they side with secularism) and the historical one (centuries as a minority under Christian power taught Jews to fear religion in the public square), and he frames them as alternatives. They reinforce each other and probably feed a third thing he names but does not develop: self-interest. A minority does well when the majority faith stays out of government, whether or not its members believe in God. Grossman gestures at all three and then declines to weigh them. The piece describes the anomaly better than it explains it.
The Liebman passage is the sharpest moment in the essay. Charles Liebman (1934-2003) cuts against the comfortable story that Jews are liberal because Judaism commands it. He points out that the tradition is folk-oriented, ethnocentric, and at points hostile to the outsider, that the neighbor to be loved was a fellow Jew, that the respect for learning meant sacred texts. Grossman pairs this with Kenneth Wald’s congregant who exhales with relief on hearing that Judaism permits his abortion politics. That anecdote does more analytical work than the survey tables around it. It shows the belief running the other direction: men reach a political position first, then conscript the tradition to bless it. Leonard Fein (1934-2014) says the quiet part himself. We are the text.
Two gaps. First, Grossman accepts James Davison Hunter’s (b. 1955) two-sided model without engaging the strongest objection to it. Morris Fiorina and others argued that the culture war was an elite and activist phenomenon and that most Americans clustered near the middle. If the binary is partly a construction of the people who profit from running the battle, then a survey showing a Jewish-Christian gap on hot-button items might track elite sorting more than mass division. He never tests this.
Second, the claim that these norms “originated as Jewish ideas” carried into Christianity is doing a lot of quiet lifting and deserves more scrutiny than he gives it. It flatters the paradox, the very people who gave the West these norms now oppose their public expression, but the genealogy is contestable, and Michael Walzer’s (b. 1935) own conclusion, which Grossman cites in a footnote, undercuts it: the Hebrew Bible offers no coherent political viewpoint. He buries the line that wounds his own setup.
The neoconservative and Orthodox sections are the most durable part now. Irving Kristol (1920-2009), Norman Podhoretz (b. 1930), Nathan Glazer (1923-2019), and Elliott Abrams (b. 1948) made an argument from group survival rather than from doctrine, and that argument reads better in 2026 than the liberal-values story does. The Orthodox forecast is the one piece of the essay you can now grade. Grossman wrote in 2013 that high Orthodox fertility, near-zero intermarriage, and intensive education might over time produce a new Jewish mainstream aligned with Christian traditionalists. The demographic trend he described has held, and Orthodox voting has moved toward the Republican side while non-Orthodox Jews stayed heavily Democratic. The split he predicted widened.
If “American Jewry” means the religiously engaged core rather than everyone who checks a box, then Orthodoxy does increasingly own that core. The Jews who attend weekly, marry Jews, and raise many Jewish children are disproportionately Orthodox, while the non-Orthodox majority grows larger in count and thinner in religious practice. Restrict the subject to the committed and “culturally predominant” gains force. But the original claim said American Jewry, not the engaged remnant, and the data on the whole population does not support the unrestricted version.
The honest verdict: a competent survey essay that names a genuine puzzle, finds the one source who dissolves the flattering version of it, and then steps back from the harder question of which force, low belief, historical fear, or interest, does the driving.
Nishma Research found a swing of R plus 12 among Modern Orthodox voters between September 2023 and 2024. So an “Orthodox future” forecast, if you cash it out, predicts a haredi-tilted future, not the synthesis Modern Orthodoxy was built to carry. Grossman’s own mature judgment runs this way. His reviewers read Living in Both Worlds as casting doubt on the movement’s future rather than celebrating its ascent. He argues that the challenges cast serious doubt on the future of Modern Orthodoxy.
As a directional bet that Orthodoxy would grow among the young while the liberal middle collapsed, the forecast is sound, and the births-and-retention motor it named is the right one. As the specific claim it made, predominance within a generation and a culturally Orthodox American Jewry, it fails on three counts: the adult share held flat, the broader culture diverged rather than converged, and the growth accrued to the haredi right rather than to the Modern Orthodox center the word “Orthodox” was quietly standing in for. C plus. The instinct was good. The headline was too fast, too broad, and aimed at the wrong wing.
Turner’s quarrel is with the phrase “shared tacit knowledge.” He treats it as a placeholder that hides the work it claims to do. There is no collective tacit object floating above a community and passing intact from one generation to the next. There are individuals who acquire habits through exposure to particular settings and particular people, and who get feedback that shapes those habits. What looks like a shared framework is a rough convergence of many separate habituations that resemble one another because the conditions of exposure resembled one another. Run that against Grossman and the book sharpens.
Start with Grossman the editor. His judgment about what enters the American Jewish Year Book, and what a communal quarrel means while it still unfolds, comes from forty years of cases, not from a rulebook he could hand to a successor. Ask him to state the rule by which he decided a dispute mattered and he could give you a plausible reconstruction, but the reconstruction would not be the source of the judgment. Turner’s expert works from accumulated exposure, not from articulable principles. Grossman is that expert. His authority as a chronicler rests on something he cannot fully write down, which is the irony at the center of his career. His whole enterprise converts a communal life that runs on tacit competence into explicit documentary prose. He turns practice into record. Turner presses the question Grossman cannot escape: what drops out in the conversion? The record preserves the disputes, the numbers, the institutional names. It cannot preserve the feel of knowing how to be Modern Orthodox, because that feel never existed as stateable content in the first place.
Now turn the frame on his subject, where it pays the most. Grossman narrates a synthesis, Torah and secular life held together, and he tracks its decline. The generic reading calls this the loss of a shared tacit synthesis. Turner blocks that reading. There was no shared thing to lose. There were many young people in the 1950s and 1960s formed by similar homes, similar schools, similar rabbis, similar streets, and the similarity of their formation produced habits that converged. The convergence looked like a common ethos. Norman Lamm could name it Torah Umadda and write it up, and Grossman notes that whether the naming ever matched a working reality stays in doubt. Turner explains the doubt. Lamm wrote down a description of a convergence. The description is the thing was always distributed across individuals and their separate exposures.
So the rightward drift is a change in the conditions of exposure that produces a different convergence. The gap year is the cleanest case. Move the formative setting from the American home and the suburban day school to the immersive Israeli yeshiva, and you change what each student is exposed to and what gets reinforced. The new habits converge on stringency because the new setting rewards stringency. Nothing was handed down and then betrayed. One exposure regime replaced another, and the output changed because the input changed. Turner gets you to that without any appeal to a betrayal, a forgetting, or a vaporous communal mind.
The codification point lands hard here, and it is the part most readers miss. Turner holds that when you try to make tacit practice explicit, you do not reveal the practice. You produce a new object. The chodosh case in Grossman shows it. A competence once carried as feel, this is how we do things, becomes an explicit stringency once someone has to state it and defend it. The stated rule claims to be the old practice made visible. Turner denies the claim. The stated rule is a replacement that wears the costume of continuity. This reframes the whole rightward shift. The stringent generation is not recovering a lost rigor that the lax generation let slip. It is generating new explicit objects in a setting that demands articulation, and then back-projecting them onto a past that ran on the unstated. The past felt looser because it ran on habit. Habit does not announce itself. Once the community has to argue about glatt and head coverings, the arguing itself moves the baseline, because no one accrues standing by writing down a relaxation.
Turner also lets you read Grossman’s own position without psychologizing it. Grossman was formed in the older regime, the native New York YU world. His skepticism toward the success of the synthesis and his eye for the drift come from the same source, the cases he was exposed to. His expertise and his sense of loss share one origin. He has a tacit baseline, acquired and not chosen, and the present reads as departure when set against it. That is not nostalgia in any soft sense. It is what exposure does to a competent observer. The baseline is real and it shapes the judgment, and the judgment is good, and Turner would still insist that the baseline is Grossman’s individual formation rather than a window onto a vanished collective mind.
The strength of Living in Both Worlds on this reading is that Grossman keeps supplying the individual-level story Turner demands. He gives the schools, the camps, the specific teachers, the gap-year pipeline, the financial strain. He names the exposure conditions. The book is most Turnerian where it is most concrete, and weakest in the few places it lets a shared ethos do explanatory work the institutions should be doing instead.
Interaction Ritual Chains (2004)
Randall Collins builds everything from one unit, the interaction ritual. Put bodies in the same place, seal the place against outsiders, lock attention onto a common focus, let a shared mood build, and the four ingredients feed back on each other until the gathering throws off four products. Solidarity in the group. Emotional energy in each person. Sacred objects that stand for the group. And moral standards, with righteous anger held in reserve for anyone who profanes the objects. Emotional energy is the currency. People carry it out of one encounter and into the next, and they steer toward the encounters that pay and away from the ones that drain. A chain forms. Grossman hands you the chain without naming it.
Sort his settings by ritual density. The Israeli yeshiva and the women’s seminary sit at the top. Students live there, eat there, pray there, study there from morning into the night. The bodies stay co-present for months. The barrier against the outside runs high, often reinforced by an ocean and a foreign language. Attention locks onto the text and the teacher. The mood climbs through shared prayer, through the singing, through the dancing on a Friday night. By Collins’s tally that setting generates emotional energy at a rate nothing in suburban America can match. The immersive summer camp and the youth movement run a notch below but on the same side of the ledger. They are bounded, sustained, hot.
Now the suburban synagogue. A few hours on Shabbat, then the members scatter into secular work and secular school for the other six days. Co-presence is thin and intermittent. The barrier leaks by design, because the whole point of the place is to send its people back out into the mixed world. Attention divides. The mood stays mild. The ritual return is low. Collins predicts the flow before Grossman documents it. Emotional energy migrates toward the hot pole and away from the cool one, and the people follow their charge.
That is the engine of the rightward drift, read as Collins reads it. The gap-year student spends a year inside the highest-yield ritual setting available to him. He returns charged, and his charge is bound to the sacred objects as the hot setting charged them, stringent observance, all-day study, the land underfoot. Set the parents’ synagogue against that, and the synagogue reads as flat. It cannot pay what Jerusalem paid. So the student revalues the cooler practice as compromise, and the revaluation arrives with moral heat, because Collins’s rituals produce indignation at the lax. The returning student polices his parents. The drift carries an affective edge, and the edge is righteous.
The piece almost no one would name is the orphaned sacred object. Modern Orthodoxy’s distinctive symbol was the synthesis, the both-worlds achievement that gave the movement its name. A sacred object survives only if some ritual keeps recharging it. The synthesis has no ritual home. No high-density encounter charges balance. You cannot dance to moderation, and you cannot stay up until two in the morning swaying over the proposition that secular culture and Torah deserve equal regard. Every hot ritual in the system charges the maximalist pole instead. So the synthesis starves while stringency gets recharged every Shabbat in the beit midrash. Collins tells you the symbol without a ritual fades and the symbol with intense backing rules. Grossman’s “Haredization” is that outcome stated in the language of observance rather than the language of emotional energy.
Stratification follows the same line. The yeshiva produces an elite measured by ritual stamina, the man who sustains the longest and most intense participation. He becomes the bearer of the sacred objects, the model the community reads as most fully charged. The Modern Orthodox professional keeps the law and then spends his day in an office, and on Collins’s accounting he cannot match the full-time learner’s output. The prestige order tilts toward the high-energy pole on its own, with no conspiracy needed. The standard rises because the standard-setters are the ones the rituals charge hardest.
The 1967 war fits the theory at the level of the rare mass event. Collins treats a war as a collective gathering of enormous reach, attention fused on a single focus, mood running hot, a sharp line drawn between us and them, and a victory left behind as a sacred narrative. After 1967 Israel turned from a distant project into a charged object for American Orthodoxy, and Grossman dates the shift there. The gap-year pipeline then routes the next generation into the physical site of the charged object, where the embodied ritual does the work the news could only begin. That last point cuts against the cross-pollination story Grossman’s interviewers raise, the digital channel, the influence of Israeli figures at a distance. Collins is cool on mediated contact. Bodies apart, weak entrainment, thin charge. The screen moves ideas. The sealed dormitory moves emotional energy. The embodied year carries the load that the feed cannot.
The marginalized Orthodox left reads the same way and gains from it. Grossman records the defeat of the initiatives for expanded ritual and leadership roles for women. In Collins the defeat is an energy deficit before it is a political loss. A partnership minyan is periodic, contested, low-barrier, easy to leave. It cannot generate what a year in a sealed seminary generates. The right out-ritualed the left. Whatever the merits of the arguments, the side with the hotter, denser, more bounded gatherings banked more emotional energy, and the energy decided the question that the debate only described.
Grossman’s charge comes from the scholarly chain, the conference, the archive, the American Jewish Year Book, the editorial desk at the American Jewish Committee. Those are real interaction rituals, but cool ones, verbal and seated, low on bodily entrainment. The measured restraint of Living in Both Worlds is the register of that chain. He documents the heat from the temperature of the seminar room. He can map where the emotional energy concentrates because he stands at a distance from it, and the same distance gives his prose its calm and gives his sense of the drift its melancholy. Collins explains the direction of the shift, toward the ritual heat, and explains, as a bonus, why the man best placed to chart the heat writes about it so coolly.
Niche construction theory corrects a lazy picture of evolution. Organisms do not just adapt to a fixed environment handed to them. They build the environment, and the build changes the pressures that then act on them and on their offspring. The beaver makes the pond and the pond remakes the beaver. Odling-Smee, Laland, and Feldman lay it out in Niche Construction: The Neglected Process in Evolution, and the part that pays off for Grossman is the second inheritance. Offspring inherit genes through one channel and a modified environment through another. The constructed surroundings persist, exert their own pressure, and often outlive the purpose that raised them. Grossman writes the natural history of a community that built its own niche so well that the niche turned on the trait that built it.
Modern Orthodoxy is a construction project before it is a theology. Grossman’s whole archive is the inventory of the build. Day schools. Yeshivas. Women’s seminaries. Summer camps. Youth movements. The eruv that turns a neighborhood into a walkable Sabbath enclosure. Kosher supervision, kosher markets, kosher restaurants. The mikveh. Yeshiva University at the center. The gap-year pipeline to Israel. The dense Orthodox neighborhood where shul, school, butcher, and friends all sit inside a square mile. A community engineered the conditions of its own life. That is niche construction in the plain sense, and Grossman documents each course of brick.
Now the feedback, which is where the frame earns its keep. The founding generation built the niche to counteract a pressure they felt in their bodies. They lived in a secular America that did not bend for them. Keeping kosher meant friction. Keeping Shabbat meant lost wages and odd looks. Staying observant while climbing into the professional class meant holding two pulls in tension every day. The synthesis, the both-worlds achievement that names the movement, was the trait selected by that friction. It answered a real pressure. The schools and the infrastructure were built to make the answer livable.
The build succeeded, and the success removed the pressure. A child raised inside the completed niche never meets the friction the niche was made to counteract. Everything around him is already kosher. Everyone around him already observes. The school, the camp, the neighborhood, the gap year wrap him in observance from birth. The secular pull that his grandfather had to resist by act of will never reaches him as a pull at all. He inherits the constructed environment and not the problem it solved. The synthesis loses its function for him, because a balance struck against a pressure means nothing to someone who has never felt the pressure. Accommodation looks like balance only when you feel the weight on the other side of the scale. Inside the sealed niche there is no weight on the other side, so accommodation reads as concession for no reason.
That is the rightward drift in the language of construction. The niche over-succeeded. By buffering out the assimilatory pull, it dissolved the case for moderation, and the energy that moderation once absorbed now flows toward intensification. The same infrastructure built to enable engagement with the secular world becomes a self-sufficient world that makes engagement optional, then suspect. Grossman names this Haredization. Niche construction names the prior step, the sealing of the environment that made Haredization the path of least resistance.
The legacy effect sharpens it. A constructed niche keeps exerting its pressure after the builders’ motives fade. The schools the founders raised to enable integration now select for fluency inside the niche, not for competence at crossing its boundary, because crossing the boundary is no longer part of daily life. The institution outlives the purpose and inverts it. Yeshiva University sits in the tightest bind here. YU is the niche built to fuse Torah and secular learning under one roof, and its environment depends on secular learning keeping its value. The broader Orthodox niche grew rich enough to support a full life, a career, a status ladder, a marriage market, all inside its own walls, so it no longer needs the secular world the way the founders did. YU defends the secular half because its constructed environment requires it. The surrounding niche has stopped requiring it. Grossman’s account of YU on the defensive is that mismatch stated in institutional terms.
The gap year is relocational construction, the move into a denser niche rather than the modification of the home one. Israel offers a more sealed environment than any American suburb can, and the student who relocates into it returns carrying the standard of the denser build. He then perturbs the home niche toward greater density, presses for glatt, for chodosh, for the stricter line, and the pressed-up standard becomes the inherited environment of the children who follow. Each round of construction tightens the niche the next round is born into. The ratchet is structural. No betrayal, no decline of will, just a built environment passed down with the pressure cranked one notch each generation.
Grossman’s own position fits the theory and explains his eyesight. He formed in an earlier, thinner niche, the postwar New York world where the infrastructure was half-built and the secular friction still pressed. He acquired the synthesis while it still had a job to do. Then he spent his career at the American Jewish Committee, a liberal, largely non-Orthodox body, which placed him at the boundary of the niche rather than deep inside it. The boundary is the one location where the synthesis stays legible, because the boundary is where contact with the secular world continues. An Orthodox man at a non-Orthodox defense organization lives the both-worlds problem as a daily condition long after the sheltered generation stopped meeting it. He can see the synthesis because he never moved fully inside the wall.
The American Jewish Year Book and Grossman’s two decades of annual essays are niche construction of the informational kind. He built part of the documentary environment the community inherits and uses to understand itself. The record is a constructed feature of the niche, passed down like the schools and the eruv. Grossman the historian builds the very niche he studies, and Living in Both Worlds is the most considered brick he laid, a description of the environment offered back to the people who live in it, in the hope that naming the build might let the next generation feel a pressure the walls have been removing for eighty years.