It was to correct common misconceptions about his thought that Jean-Paul Sartre, the most dominent European intellectual of the post-World War II decades, accepted an invitation to speak on October 29, 1945, at the Club Maintenant in Paris. The unstated objective of his lecture ("Existentialism Is a Humanism") was to expound his philosophy as a form of "existentialism," a term much bandied about at the time. Sartre asserted that existentialism was essentially a doctrine for philosophers, though, ironically, he was about to make it accessible to a general audience. The published text of his...