". . . a major contribution to Heidegger scholarship . . ." —Journal of the History of Behavioral Sciences "Van Buren's portrayal of these formative years is striking and vital to all future Heidegger scholarship." —Christian Century "Van Buren presents a clear and cogent argument for the theory that Martin Heidegger's mature thought, epitomized in Being and Time, actually was a return to his youthful theory and concerns. . . . Van Buren's ability to present a rounded discussion while using Heidegger's own technical vocabulary is highly commendable." —Library Journal " . . . here at last is a work on the philosopher that is of fundamental philosophical-historical import. Van Buren's book is both interesting and well written . . . " —Choice " . . . a readable, interesting, and first-rate book." —John D. Caputo A startling new reading of Martin Heidegger's early thought leading up to Being and Time (1927) and its subsequent development in his later writings.