Heidegger is now widely recognized as one of the most influential philosophers of the twentieth century, yet much of his later philosophy remains shrouded in confusion and controversy. Restoring Heidegger's understanding of metaphysics as 'ontotheology' to its rightful place at the center of his later thought, this book explains the depth and significance of his controversial critique of technology, his appalling misadventure with Nazism, his prescient critique of the university, and his important suggestions for the future of higher education. It will be required reading for those seeking to understand the relationship between Heidegger's philosophy and National Socialism as well as the continuing relevance of his work.