Amos Tversky

Amos Tversky (March 16, 1937 – June 2, 1996) was an Israeli psychologist and cognitive scientist whose groundbreaking research fundamentally transformed our understanding of human judgment and decision-making. Working primarily in collaboration with Daniel Kahneman at Hebrew University, Tversky conducted seminal experiments demonstrating systematic biases and heuristics in human reasoning that contradicted traditional rational choice theory. Their collaborative work led to the development of prospect theory, which explains how people evaluate potential losses and gains, demonstrating that individuals are risk-averse when considering gains but risk-seeking when facing losses. This theoretical framework became foundational to behavioral economics and psychology, reshaping how economists and policymakers understand human behavior. Tversky's research on cognitive biases—including anchoring, availability heuristic, and representativeness—revealed that human judgment deviated from pure rationality in consistent, predictable ways. Beyond prospect theory, Tversky made important contributions to probability theory, decision analysis, and mathematical psychology. His collaboration with Kahneman produced some of the most cited research in social science, earning them international recognition and influencing disciplines from economics to medicine to law. Though Tversky died before Kahneman received the 2002 Nobel Prize in Economics for their work, his intellectual legacy remains central to contemporary understanding of how humans make decisions.