Israeli-American psychologist, Princeton professor from 1993 to his death in 2024, Nobel laureate in economics (2002); with his long-time collaborator Amos Tversky (1937–1996), the author of the body of experimental work that established behavioral economics as a field and reshaped the social-scientific picture of human decision-making away from the rational-choice assumption that had dominated economics for most of the twentieth century.
Kahneman was born in Tel Aviv in 1934, spent the war years in occupied France (his father was briefly interned at Drancy), and returned with his family to Mandate Palestine after liberation. He took his BA at Hebrew University, did his doctorate at Berkeley, and served as a psychologist in the Israeli Defense Forces, where his reform of officer-selection interviews — moving from holistic assessment to structured scoring on discrete traits — is still the basis of IDF practice. From 1969, back at Hebrew University, he began the collaboration with Tversky that became the core of his work.
The Kahneman-Tversky program of the 1970s produced the heuristics and biases research program: the demonstration, in long series of controlled experiments, that ordinary human reasoning under uncertainty systematically deviates from the predictions of expected-utility theory, in patterned and reproducible ways. Representativeness, availability, and anchoring — the three original heuristics — produce base-rate neglect, availability cascades, and anchoring effects. Prospect theory (1979, with Tversky; Econometrica, the most cited paper in the journal's history) replaced expected-utility theory with a model that treats people as loss-averse, reference-dependent, and disposed to overweight small probabilities — predictions that match actual choice behavior where the rational-choice model does not. The 2002 Nobel was awarded for this work; Tversky, who would have shared it, had died in 1996.
Thinking, Fast and Slow (2011) is the book-length statement for a general readership: the framework of "System 1" (fast, intuitive, associative, frequently accurate but systematically biased) and "System 2" (slow, effortful, rule-following, capable of correcting System 1 but lazy and capacity-limited). The book became a publishing phenomenon — more than ten million copies in translation — and the main conduit through which the Kahneman-Tversky research reached general educated readers.
The later work is more cautious. Noise: A Flaw in Human Judgment (2021, with Olivier Sibony and Cass Sunstein) argues that noise — the unwanted variability in decisions that should be the same — is a larger source of error in professional judgment than bias, and that institutional remedies (structured protocols, aggregation) can reduce it. Kahneman also participated publicly in the post-2011 "replication crisis" in social psychology, acknowledging that some of the priming studies he had cited in Thinking, Fast and Slow had failed to replicate.
Kahneman earns his place because the heuristics-and-biases program reshaped what economics and political science could assume about human decision-making, and so reshaped the inequality, regulation, and democratic-competence debates the graph tracks.