Book excerpt: Martin Heidegger is one of the twentieth century's most important philosophers. His ground-breaking works have had a hugely significant impact on contemporary thought through their reception, appropriation and critique. His thought has influenced philosophers as diverse as Sartre, Merleau-Ponty, Arendt, Adorno, Gadamer, Levinas, Derrida and Foucault, among others. In addition to his formative role in philosophical movements such as phenomenology, hermeneutics and existentialism, structuralism and post-structuralism, deconstruction and post-modernism, Heidegger has had a transformative effect on diverse fields of inquiry including political theory, literary criticism, theology, gender theory, technology and environmental studies. The Bloomsbury Companion to Heidegger is the definitive reference guide to Heidegger's life and work, presenting fifty-eight original essays written by an international team of leading Heidegger scholars. The volume includes comprehensive coverage of Heidegger life and contexts, sources, influences and encounters, key writings, major themes and topics, and reception and influence. This is the ideal research tool for anyone studying or working in the field of Heidegger Studies today.