I am prompted to ask this momentous question by an item in The New York Times pronouncing Wittgenstein to be the one. In order to bring this matter to a close, please vote only once in the following poll; I have listed all reasonable candidates (excluding Frege and Husserl, who are very much products of 19th-century philosophical culture--perhaps the same could be said for Bergson, but...).
ADDENDUM: I think we'll have a run-off based on the top vote getters in this round, so that we can get a scientifically sound result!
AND ONE MORE: Dearest readers, this is purely for amusement, no need to e-mail me about the 'order bias' or the composition of the list. We all know, in advance, the ten or so who are likely to get the most votes. Feel free to play, or not.
AN APT COMMENT from a reader: "I actually find these exercises more indicative of what current members of the profession are currently thinking of as central than of any indication of greatness (you might recall that Hume thought Addison was destined to be a greater philosopher than Locke... oh well)." Someone should tell The New York Times.