Hans D. Sluga (; born April 24, 1937) is a German philosopher who spent most of his career as professor of philosophy at the University of California, Berkeley. Sluga teaches and writes on topics in the history of analytic philosophy, the history of continental philosophy, as well as on political theory, and ancient philosophy in Greece and China. He has been particularly influenced by the thought of Gottlob Frege, Ludwig Wittgenstein, Martin Heidegger, Friedrich Nietzsche, and Michel Foucault. Education and career Hans Sluga studied at the University of Bonn and the University of Munich. He subsequently obtained a BPhil at Oxford, where he studied under R. M. Hare, Isaiah Berlin, Gilbert Ryle and Michael Dummett. Since 1970, Sluga has been a professor of philosophy at the University of California, Berkeley, serving from 2009 as the William and Trudy Ausfahl Professor of Philosophy until his retirement in 2020. He previously served as a lecturer in philosophy at University College London. Philosophical work Sluga describes his philosophical orientation as follows: "My overall philosophical outlook is radically historicist. I believe that we can understand ourselves only as beings with a particular evolution and history." He has worked extensively on the early history of analytic philosophy. In his writings on Gottlob Frege he has sought to establish the influence of Immanuel Kant, Hermann Lotze, and of Neo-Kantians like Cuno Fischer and Wilhelm Windelband on Frege's views on the foundations of mathematics and in the theory of meaning. This historically oriented approach to Frege's thought brought him into sharp conflict with Michael Dummett's "realist" interpretation of Frege. Sluga's work in analytic philosophy has been influenced substantially by Wittgenstein to whose early and late writings he has devoted a number of studies. His writings on both Frege and Wittgenstein have contributed to the development of the study of the history of analytic philosophy as a field within analytic philosophy. Since the early 1990s Sluga has become increasingly concerned with political philosophy. In Heidegger's Crisis he set out to explore the question why philosophers from Plato till the present get so often entangled in dangerous political affairs. Sluga analyzes Heidegger's political engagement by putting it into the larger context of the development of German philosophy in the Nazi period. He seeks to show thereby that many diagnoses of Heidegger's politics are misdirected because of their overly narrow focus on the person and work of Heidegger. He challenges,