Alain Badiou is emeritus professor of philosophy at the École Normale Supérieure in Paris. Barbara Cassin is a French linguist and philosopher and director of research at the National Center for Scientific Research in Paris.

Martin Heidegger was an ordinary Nazi and a loyal member of the provincial petty bourgeoisie. He was also a seminal thinker of the Continental tradition and one of the twentieth century's most important philosophers. How are we to make sense of this mix? Should we factor Heidegger's domestic and political associations into our understanding of his thought, or should we treat his intellectual work independently of his abhorrent politics? How does any thinker reconcile the mundane with the ideal, or the pursuit of philosophical inquiry with the demands of civic engagement? In Heidegger, Alain Badiou and Barbara Cassin immerse themselves in the philosopher's correspondence to answer these questions as they relate to Heidegger and all thinkers vulnerable to their times. They focus on Heidegger's tormented relationship with his wife, Elfrida, Hannah Arendt, and numerous other women, bringing an unusual level of intimacy to his personal and intellectual worlds.