Gabriel Rockhill is assistant professor of philosophy at Villanova University, program director at the College International de Philosophie, and the author, most notably, of Logique de l'histoire: Pour une analytique des pratiques philosophiques.Alfredo Gomez-Muller is professor of Latin American studies at the Francois-Rabelais University in Tours and the author of numerous books, including Sartre: De la nausee a l'engagement and Ethique, coexistence et sens.