Daniel Kahneman

Daniel Kahneman was born in Tel Aviv in 1934 while his mother was visiting family from Paris, where his Lithuanian Jewish parents lived. He spent the years of the Nazi occupation in hiding and in flight, moving through France and surviving by luck and careful concealment — experiences he later described as formative in ways he could not fully articulate. After the war his family emigrated to what became Israel in 1948, and Kahneman studied psychology at the Hebrew University of Jerusalem before earning his doctorate at the University of California, Berkeley.

Returning to Israel, he taught at Hebrew University and began a collaboration with his colleague Amos Tversky that would last until Tversky's death in 1996 and would transform psychology and economics. Their joint work, conducted through a series of ingenious experiments in the 1970s and 1980s, demonstrated systematically that human judgment under uncertainty is not the rational calculation that standard economic theory assumed, but rather relies on mental shortcuts — heuristics — that are useful most of the time but produce predictable, systematic errors in specific conditions. The papers they published together, particularly "Judgment under Uncertainty: Heuristics and Biases" (1974) and "Prospect Theory: An Analysis of Decision under Risk" (1979), are among the most cited in social science history. Kahneman was awarded the Nobel Prize in Economic Sciences in 2002; Tversky had died six years earlier and was ineligible.

Thinking, Fast and Slow (2011) is the full synthesis of Kahneman's career's work, written for general readers. It organizes decades of experimental findings around the framework of two cognitive systems: System 1, which operates automatically, quickly, and with little effort; and System 2, which is deliberate, effortful, and slow. The framework is explicitly a simplification — Kahneman says so — but it is a clarifying simplification that allows him to introduce, in accessible sequence, the full landscape of cognitive biases: anchoring, availability, representativeness, framing effects, loss aversion, the planning fallacy, and many others. The book is careful to acknowledge where the science is contested and where his own previous conclusions have required revision.

Kahneman died in March 2024. He left behind not just a body of research but a vocabulary — "loss aversion," "cognitive bias," "System 1 and System 2" — that is now part of the common language of anyone who thinks about human behavior, and Thinking, Fast and Slow remains the best introduction to why we are so reliably wrong in such predictable ways.