 In his over thirty years at Harvard, Lewis taught some of the most eminent American philosophers of the last half of the twentieth century as graduate students, including W.V. Quine, Nelson Goodman, Roderick Chisholm, Roderick Firth, and Wilfrid Sellars. Although only Chisholm and Firth of these five were supervised by Lewis, and Sellars left Harvard without graduating, all five refer occasionally to Lewis in their writings, usually critically, and their own views sometimes developed in reaction to his. (Baldwin 2007 has an excellent discussion of the influence of Lewis on Quine, and of Lewis’s philosophy generally.)