1930 – 2018
Isaac Levi (1930–2018) was an American philosopher and professor at Columbia University known for his pragmatist-influenced work in epistemology, decision theory, and the philosophy of probability. He developed an original framework of belief revision and rational choice that challenged Bayesian orthodoxy, emphasizing suspension of judgment and indeterminate probabilities.
Developed a decision-theoretic account of rational belief and commitment in 'The Enterprise of Knowledge' (1980)
Advanced a theory of indeterminate probabilities challenging strict Bayesianism
Formulated influential accounts of belief revision and contraction in epistemology
Authored 'Hard Choices' (1986) on decision-making under unresolved conflict
Extended Peircean pragmatism into contemporary formal epistemology