[I]t was precisely during that year 1945, that he met the man who changed his life : cultural coordinator of the Army division of the Rhine et Danube, and in order to prepare a meeting between philosophers Sartre and Heidegger, he went to the Black Forrest to talk to the German philosopher whose Sein und Zeit had dazzled him.He gave Heidegger a copy of L'être et le néant. In the Fall he returned to Paris with Heidegger's letter to Sartre, expressing his agreement with a meeting in Baden-Baden and inviting Sartre to Todtnauberg.