Jonathan Haidt

Introduction

Jonathan David Haidt (born 19 October 1963) is an American social psychologist who argues that moral judgement is not what it feels like. In the ordinary experience of making a moral call, a person reasons their way to a conclusion. In Haidt's account, the reasoning is almost always the other way round: an intuitive, affective reaction arrives first and near-instantly, and conscious reasoning is recruited afterwards to justify it — usually to other people, and usually without the reasoner noticing that the justification came second.

He made that case in a series of experiments beginning in the late 1990s, most famously through moral dumbfounding: participants condemn a harmless action, cannot say why, and when every reason they offer is dismantled, they do not withdraw the judgement but simply restate it. The finding is the empirical core of his social intuitionist model, and it set him against the rationalist tradition of Kohlberg's stages of moral development, which treated moral judgement as the output of reasoning.

From there Haidt built moral foundations theory, the claim that moral intuitions rest on a small set of innate, evolved foundations — care, fairness, loyalty, authority, sanctity, and later liberty — and that political disagreement is largely disagreement about which foundations matter. That framework became one of the most widely used in moral psychology and the basis of The Righteous Mind (2012).

In the 2020s his work moved toward a different target. The Coddling of the American Mind (2018) and The Anxious Generation (2024) argue that smartphone-based childhood and what he calls safetyism have produced a generation-wide deterioration in adolescent mental health. The second book became a bestseller with measurable policy consequences — it is widely credited with influencing Australia's under-16 social media ban — and it also drew the sharpest criticism of his career, from researchers who argue that the causal claim is not supported by the evidence.

Early Life and Education

Haidt was born in New York City and raised in Scarsdale, New York, in a secular Jewish family. His grandparents emigrated as teenagers from Russia and Poland and worked in the garment trade; his father was a corporate lawyer. He has described the household as conventionally New Deal liberal, and himself as an atheist by fifteen. At seventeen, reading existentialist literature — Waiting for Godot in particular — produced what he later called an existential crisis, and an enduring interest in the question of how people find meaning.

He graduated from Yale University magna cum laude with a BA in philosophy in 1985, then worked briefly as a computer programmer before going to the University of Pennsylvania for graduate study in psychology on a National Science Foundation fellowship. He took his MA in 1988 and his PhD in 1992.

His dissertation, supervised by Jonathan Baron and Alan Fiske, was titled "Moral judgment, affect, and culture, or, is it wrong to eat your dog?" The question is literal: Haidt studied why people condemn actions that harm no one — eating a pet that died of natural causes, cleaning a toilet with a national flag — and find them wrong anyway. He was inspired by Paul Rozin's work on disgust, and the dissertation established the two themes that have organised his career: the centrality of affect in moral judgement, and the role of culture in shaping what triggers it.

Academic and Professional Career

Chicago, India, and cultural psychology

From 1992 to 1994 Haidt was an NIMH postdoctoral fellow at the University of Chicago, studying cultural psychology under the anthropologist Richard Shweder — whom Haidt has called the teacher who most affected him. At Shweder's suggestion he spent three months doing fieldwork in Bhubaneswar, Odisha, conducting interviews on moral judgement in a society he has described as in some ways patriarchal and illiberal.

The India fieldwork was decisive. It made the cultural variation in moral judgement impossible to explain as variation in reasoning capacity, and it pushed him toward the view that morality is a set of intuitions shaped by culture acting on an evolved substrate — the position that later became moral foundations theory. He then spent 1994–95 as a MacArthur Foundation postdoctoral associate working under Judith Rodin.

Virginia

Haidt joined the University of Virginia in 1995 as an assistant professor, becoming associate professor in 2001 and full professor in 2009. He stayed until 2012, won four teaching awards — including the State Council of Higher Education for Virginia's Outstanding Faculty Award, conferred by Governor Mark Warner in 2004 — and did most of the research that made his reputation: the moral dumbfounding studies, the social intuitionist model, the work on disgust, and the development of moral foundations theory with Craig Joseph and Jesse Graham.

He spent 2006–07 at Princeton as the Laurance S. Rockefeller Visiting Professor for Distinguished Teaching, and 2007–08 as a Visiting Distinguished Fellow at the Sage Center for the Study of the Mind at UC Santa Barbara.

New York University

In 2011–12 Haidt was the Henry Kaufman Visiting Professor of Business Ethics at NYU's Stern School of Business, and from 2012 he has been the Thomas Cooley Professor of Ethical Leadership there. The move was a deliberate shift of audience: at Stern he applies moral psychology to business ethics, asking how organisations can be structured to resist ethical failure rather than how individuals can be trained to resist temptation.

Alongside the academic post he co-founded several organisations: Ethical Systems (2013), a non-profit translating ethics research for business; Heterodox Academy (2015), which campaigns for viewpoint diversity and open inquiry in universities; the Constructive Dialogue Institute; and Let Grow, which promotes independent childhood play. He has given four TED talks, was named a Top 100 Global Thinker by Foreign Policy in 2012, and was elected to the American Academy of Arts and Sciences in 2019.

Major Contributions to Psychology

The social intuitionist model

Haidt's 2001 paper "The emotional dog and its rational tail" set out the positive claim behind his critique of rationalism. Its central assertions:

• Intuitions come first. Moral judgements appear rapidly, automatically, and with affective valence, before any conscious reasoning occurs.
• Reasoning is post-hoc. Deliberate reasoning is mostly confabulation — the construction of a justification for a judgement already made. In his metaphor, the elephant (intuition) moves, and the rider (reasoning) explains where it was going all along.
• Reasoning works socially. Its real function is not self-correction but persuasion: supplying arguments that move other people's intuitions.
• Judgement can change through others. Because intuitions are socially calibrated, moral change happens mostly through exposure to other people's reactions rather than through argument.

The model is a direct challenge to the developmental tradition running from Piaget to Kohlberg, in which mature moral judgement is the achievement of reasoning. Haidt does not deny that reasoning matters — he allows for a "private judgment" route in which individuals reason independently, and for the effect of reasoned argument on others — but he treats it as the exception rather than the mechanism.

Moral dumbfounding

The experimental basis is the dumbfounding finding. Participants read a vignette describing a consensual, protected, emotionally unharmful sexual encounter between adult siblings who never meet again, and are asked whether it was wrong. Most say yes. When the experimenter points out that no one was harmed, that there was no coercion, that the risk of conception was eliminated, and that the pair were not distressed, participants typically concede each point — and then hold the judgement anyway, sometimes saying "I know it's wrong, I just can't explain why."

The point is not that the participants are irrational. It is that the judgement has a source the participants cannot access and cannot report, which is what an intuition is. Haidt's reading is that the research tradition had been studying the wrong thing: not how people reason about morality, but how they rationalise moral reactions.

Moral foundations theory

Developed with Craig Joseph from 2004 and later refined with Jesse Graham and others, moral foundations theory proposes that human moral intuition rests on a small number of innate, evolved systems, each with a characteristic trigger, emotion, and virtue:

The first five came from the original formulation; liberty was added in The Righteous Mind after work on libertarian moral intuitions.

The political application is the part that made the theory famous. Haidt's argument is that progressives rely heavily on care and fairness while treating loyalty, authority and sanctity as suspect, whereas conservatives draw on all of them (or all six). Each side therefore tends to experience the other not as mistaken but as immoral — because each is responding to moral considerations the other side does not register. He developed the Moral Foundations Questionnaire and the YourMorals.org site to measure and demonstrate this.

The theory has been among the most productive in moral psychology, and it has been contested on several fronts (see below).

Moral emotions: disgust and elevation

Haidt's early empirical work was on disgust, extending Rozin's account into the moral domain: the finding that physical disgust sensitivity predicts the severity of moral condemnation, and that inducing disgust — through a bad smell, a dirty room, or a hypnotic suggestion — makes moral judgements harsher. The interpretation of these effects has been a live methodological controversy, and several of the hypnotic-disgust findings have not replicated cleanly.

He then turned to the neglected positive side, coining and studying elevation: the warm, opened feeling produced by witnessing exceptional moral beauty, and its tendency to motivate prosocial behaviour. Work with Sara Algoe and others established elevation as a measurable state distinct from happiness and admiration. This period also produced his involvement with positive psychology — he won the Templeton Prize in Positive Psychology in 2001 and edited the volume Flourishing.

The Happiness Hypothesis

The Happiness Hypothesis (2006) was his attempt to test ancient philosophical claims about happiness against modern evidence — using, as its central metaphor, the rider and the elephant. Its most durable contribution is the "happiness formula": H = S + C + V, set point plus conditions of life plus voluntary activities. The argument is that because adaptation erases the gains from changed circumstances, durable increases in well-being come mostly from voluntary activity — exercise, meditation, relationships, and commitments to something beyond the self.

Social media, safetyism, and adolescent mental health

In the last phase of his career Haidt turned to questions about childhood and technology. The Coddling of the American Mind (2018, with Greg Lukianoff) argued that three ideas — that what doesn't kill you makes you weaker, that you should always trust your feelings, and that life is a battle between good and evil people — combine with overprotection to produce what the authors call safetyism: the treatment of emotional safety as a sacred value, at the cost of the antifragility that children develop through unsupervised risk.

The Anxious Generation (2024) makes a causal claim: that the shift from a play-based to a phone-based childhood, concentrated in the years roughly 2010–2015, is the principal cause of the sharp international rise in adolescent anxiety and depression. Haidt proposes four norms — no smartphone before high school, no social media before sixteen, phone-free schools, and far more unsupervised free play.

Major Publications

• The Happiness Hypothesis: Finding Modern Truth in Ancient Wisdom (2006) — ancient philosophy tested against modern psychology
• Flourishing: Positive Psychology and the Life Well-Lived (2003, ed. with Corey Keyes) — the positive psychology of moral development
• The Righteous Mind: Why Good People Are Divided by Politics and Religion (2012) — moral foundations theory applied to political ideology; won the Zocalo Book Prize and the SPSP Media Book Prize
• The Coddling of the American Mind (2018, with Greg Lukianoff) — safetyism and the crisis of American higher education
• The Anxious Generation: How the Great Rewiring of Childhood Is Causing an Epidemic of Mental Illness (2024) — the case that phone-based childhood caused the adolescent mental health crisis
• "The emotional dog and its rational tail: A social intuitionist approach to moral judgment" (2001, Psychological Review) — the canonical statement of the social intuitionist model

Impact and Legacy

Haidt's influence runs along two quite separate tracks, and they have attracted criticism of very different kinds.

In moral psychology, he changed the field's default assumption. The claim that moral judgement is driven by intuition and that reasoning is largely post-hoc justification is now a standard position, and moral foundations theory is one of the most widely used frameworks in the field. The measurement tools he built — the Moral Foundations Questionnaire, YourMorals.org — enabled a large volume of subsequent work, including by his critics.

In public life, the reach is unusual for a social psychologist. The Anxious Generation sold over two million copies and is repeatedly cited as a direct influence on national policy: Australia's premier of South Australia read it and pushed for the under-16 social media ban that took effect in 2025, and Indonesia, Brazil, Turkey, the UK and Malaysia have since legislated or moved in the same direction.

Criticism

The academic critique of The Anxious Generation is the most serious of his career, and it comes from researchers who largely share his concerns. The developmental psychologist Candice Odgers argues that the book's central claim is not supported: most of the data is correlational, the longitudinal associations that do exist often run in the opposite direction (adolescents with existing mental health problems use platforms more), a 72-country analysis found no consistent association between well-being and social media penetration, and multiple meta-analyses converge on small and mixed effects. Others have accused him of "making up stories by simply looking at trend lines," and at least one statistician has argued that several of the studies he cites are misrepresented and that some contradict his argument. The US National Academies' 2024 report concluded that a causal relationship between social media and adolescent health is difficult to establish on the existing evidence.

A second line of criticism concerns data selection. Haidt presents rising adolescent distress as an Anglophone and Nordic trend requiring an international explanation; critics point out that South Korean adolescent depression fell between 2006 and 2018, that US suicide rates rose across nearly all age groups rather than teenagers specifically, and that a change in screening practice following the Affordable Care Act — new annual depression screening for adolescent girls — accounts for part of the apparent rise. Haidt has replied that his critics are applying the wrong standard of proof and misreading his claims, arguing that the precautionary case for action does not require the certainty of a randomised trial.

Moral foundations theory has its own critical literature. The best-known finding — that progressives draw on two foundations and conservatives on five or six — has been challenged as an artefact of questionnaire design, and later work has found more symmetrical foundation use than the theory predicts. The factor structure of the Moral Foundations Questionnaire has been questioned, particularly its measurement invariance across cultures, which matters because the theory's central claims are cross-cultural. The evolutionary story — that each foundation is an innate module shaped by a specific ancestral adaptive problem — is difficult to test and is generally treated as a heuristic rather than an established account. And some critics have argued that the theory's framing of political disagreement as symmetrical moral difference is itself a political position rather than a neutral description of one.

Associated Figures

• Richard Shweder — his postdoctoral mentor at Chicago, and the source of the cultural psychology that shaped moral foundations theory
• Paul Rozin — whose work on disgust supplied the empirical starting point for his dissertation
• Craig Joseph and Jesse Graham — principal collaborators on moral foundations theory
• Sara Algoe — collaborator on the psychology of elevation
• Greg Lukianoff — co-author of The Coddling of the American Mind
• Martin Seligman — whose positive psychology movement he joined in 1999
• Lawrence Kohlberg — the rationalist account of moral development his work was written against

External Resources

• Jonathan Haidt's faculty profile at NYU Stern
• Heterodox Academy

Learn More

• Moral Psychology
• Kohlberg's Stages of Moral Development
• Positive Psychology
• Thinking and Reasoning
• History of Psychology
• Edward Royzman — whose work on moral dumbfounding questions how much reasoning actually drives moral judgement
• All Psychologists A–Z

References

• Haidt, J. (2001). The emotional dog and its rational tail: A social intuitionist approach to moral judgment. Psychological Review, 108(4), 814-834.
• Haidt, J. (2006). The Happiness Hypothesis. Basic Books.