Martin Heidegger
Marburg

In 1923, Heidegger was elected to an extraordinary professorship in philosophy at the University of Marburg. His colleagues there included Rudolf Bultmann, Nicolai Hartmann, Paul Tillich, and Paul Natorp. Heidegger's students at Marburg included Hans-Georg Gadamer, Hannah Arendt, Karl Löwith, Gerhard Krüger, Leo Strauss, Jacob Klein, Günther Anders, and Hans Jonas. Following Aristotle, he began to develop in his lectures the main theme of his philosophy: the question of the sense of being. He extended the concept of subject to the dimension of history and concrete existence, which he found prefigured in such Christian thinkers as Paul of Tarsus, Augustine of Hippo, Martin Luther, and Søren Kierkegaard. He also read the works of Wilhelm Dilthey, Husserl, Max Scheler, and Friedrich Nietzsche.

In 1925, a 35-year-old Heidegger began what would be a four-year affair with Hannah Arendt, who was then 19 years old and his student. Like Blochmann, Arendt was Jewish. Heidegger and Arendt agreed to keep the details of the relationship a secret, preserving their letters, but keeping them unavailable. The affair was not widely known until 1995, when Elzbieta Ettinger gained access to the sealed correspondence. Nevertheless, Arendt faced criticism for her association with Heidegger after his election as rector at the University of Freiburg in 1933.

In 1927 Heidegger published his main work, Sein und Zeit (Being and Time). He was primarily concerned to qualify to be a full professor. The book, however, did more than this: it raised him to "a position of international intellectual visibility."
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