In Four Seminars, Heidegger reviews the entire trajectory of his thought and offers unique perspectives on fundamental aspects of his work. First published in French in 1976, these seminars were translated into German with Heidegger's approval and reissued in 1986 as part of his Gesamtausgabe, volume 15. Topics considered include the Greek understanding of presence, the ontological difference, the notion of system in German Idealism, the power of naming, the problem of technology, danger, and the event. Heidegger's engagements with his philosophical forebears?Parmenides, Heraclitus, Kant, and Hegel?continue in surprising dialogues with his contemporaries?Husserl, Marx, and Wittgenstein. While providing important insights into how Heidegger conducted his lectures, these seminars show him in his maturity reflecting back on his philosophical path. An important text for understanding contemporary philosophical debates, Four Seminars provides extraordinarily rich material for students and scholars of Heidegger.