Heidegger

Heidegger's *Being and Time* (1927) is the long question: what does it even mean for anything to *be*? Western philosophy, from Plato onward, had taken being for granted while obsessing over particular beings. Heidegger's project was to wake up the question.

The method is phenomenology — describe the structures of experience as they actually present themselves — but Heidegger pushes it toward fundamental ontology. He starts not with a disinterested subject contemplating objects, but with *Dasein*: the being for whom being is a question. That's us. We don't first encounter the world as a collection of objects, then add meanings; we encounter it always already meaningful, organized by our concerns and projects. A hammer isn't first a lump of stuff plus the property "for hammering"; it's *zuhanden* — ready-to-hand, embedded in a workshop of involvements. Only when it breaks does it become *vorhanden* — present-at-hand, the bare thing we then theorize about.

The book's other monument is Heidegger's analysis of authenticity. Most of the time, we live as "das Man" — the They, the impersonal anyone — borrowing our opinions, tastes, even our anxieties from the public sphere. Authenticity is the rare move of facing our own being-toward-death and choosing our possibilities as our own. The framework runs through Sartre, the entire existentialist tradition, and a lot of twentieth-century theology.

Then there's the Nazi problem. Heidegger joined the Nazi party in 1933 as rector of Freiburg, gave speeches in line with the regime, and never explicitly recanted. The *Black Notebooks* (released starting 2014) contain unmistakable antisemitism. How much this contaminates the philosophy is a serious, ongoing debate — split roughly between those who think the work survives quarantining the man and those who think the philosophy itself contains the seeds of what he chose.

Later Heidegger (the *Letter on Humanism*, *The Question Concerning Technology*) shifts toward a more poetic, meditative idiom about language as "the house of Being." Influential on Derrida, Gadamer, much of continental philosophy.