In A History of Philosophy in the Twentieth Century, Christian Delacampagne reviews the discipline's divergent and dramatic course and shows that its greatest figures, even the most unworldly among them, were deeply affected by events of their time. From Ludwig Wittgenstein, whose famous Tractatus was actually composed in the trenches during World War I, to Edmund Husserl and Martin Heidegger--one who found himself barred from public life with Hitler's coming to power, the other a member of the Nazi party who later refused to repudiate German war crimes. From Bertrand...