Martin Heidegger (1889-1976) spent most of his career teaching at the University of Freiburg. His most prominent works include "Being and Time," "Discourse on Thinking," "Identity and Difference," "What Is Called Thinking?," and "Poetry, Language, Thought," Joan Stambaugh is a professor emerita of philosophy at Hunter College of the City University of New York. She is the author, most recently, of "The Finitude of Being," "The Other Neitzsche," and "The Formless Self,"