David Lewis was born in Oberlin, Ohio. He studied as an undergraduate at Swarthmore College before gaining a PhD in philosophy from Harvard University in 1967 where he studied with Willard van Orman Quine. His first job was at the University of California at Los Angeles, where he worked from 1966–1970, before moving to Princeton University where he worked for the rest of his career. Lewis published four monographs and more than one hundred papers, most of which have been gathered into five volumes of his collected papers. Lewis made contributions to virtually every area of contemporary Anglo-American philosophy but is probably best known for his contributions to metaphysics, in particular, his work on modality (necessity and possibility) and possible worlds and also his theories of laws of nature, causation, and chance. His work in the philosophy of mind has also been influential, as has his...