Who is the greatest modern day thinker? Most of the responses are silly—Homer Simpson, Stan on South Park, L. Ron Hubbard, etc. The striking thing is that so few people nominate anyone contemporary philosophers tend to take seriously. Depending on how loosely one defines “modern day,” within philosophy Bertrand Russell, Ludwig Wittgenstein, Rudolf Carnap, W. V. O. Quine, Wilfrid Sellars, Saul Kripke, and David Lewis all strike me as plausible answers. Of those, only Kripke is living, and three comments do nominate him. Some nominate economists (e.g., Milton Friedman) or scientists (e.g., Einstein, Feynman). Whom would you nominate?