Isaac Levi is one of the preeminent philosophers in the areas of pragmatic rationality and epistemology. This collection of essays presents his original and influential ideas about rational choice and belief. A wide range of topics is covered, including consequentialism and sequential choice, consensus, voluntarism of belief, and the tolerance of opinions. This major collection will be of interest to a wide range of philosophers in epistemology, logic, and philosophy of science, as well as economists, decision theorists, and statisticians.