Martin Heidegger's philosophical thought has been a guiding presence on the European continent for half a century, having influenced virtually every area of the human sciences from psychology to art in what must be called a revolutionary way. And, yet, a meaningful understanding of the enormous importance of his thinking, especially of his unmethodical methodological impulse, which informs the more immediately appealing "existential analytic" in Being and Time (Sein und Zeit, 1927) and his later ontological meditations in such texts as Holzwege (1936–46), Vorträge und Aufsätze (1936–53), Gelassenheit (1944–55), and Unterwegs zur Sprache (1950–59), is still limited in the United States and England to a small community of philosophers who have responded to the crisis of the human sciences. This is the case despite the important ground broken by the American schools of theology, above all by Union Theological Seminary during the postwar (Tillichean) period, and, more recently, by publishers such...