This major new study of Heidegger is the first to examine in detail the concept of existential truth that Heidegger developed in the 1920s. Daniel Dahlstrom offers a critical focus on the genesis, nature, and viability of Heidegger’s radical reconceptualisation. The book has several distinctive and innovative features. First, it is the only study that attempts to understand the logical dimension of Heidegger’s thought in its historical context. Second, no other book-length treatment explores the breadth and depth of Heidegger’s confrontation with Husserl, his erstwhile mentor. Third, the book demonstrates that Heidegger’s deconstruction of Western thinking occurs on three interconnected fronts: truth, being, and time. Dealing with a crucial aspect of the philosophy of one of the great thinkers of the twentieth century, this book will be important to all scholars and students of Heidegger, be they in philosophy, theology, or literary studies.