He has taught at Reed College, Rice University, and the Central European University. He has published widely on twentieth-century French and German political thought. His books have been translated into eight languages. He has been a frequent contributor to The New Republic and Dissent. Among his books are: Walter Benjamin: An Aesthetic of Redemption (Columbia UP, 1982), The Politics of Being: The Political Thought of Martin Heidegger (Columbia UP, 1990), Heidegger's Children: Hannah Arendt, Karl Lowith, Hans Jonas, and Herbert Marcuse(Princeton UP, 2001), which has been translated into five languages: Spanish, Dutch, Swedish, Japanese and Chinese, and The Seduction of Unreason: The Intellectual Romance with Fascism from Nietzsche to Postmodernism (Princeton UP, 2004). In January 2002 The Chronicle of Higher Education featured a profile of his scholarly achievements entitled "Losing Friends and Influencing People."