Professor Sluga has broad philosophical interests of both a systematic and a historical kind. These cross the boundaries of so-called “analytic” and “Continental” philosophy. From the latter tradition he has acquired a strongly historical bent. From the analytical tradition he has gained an appreciation of clarity and logical order.
His training in philosophy began with the study of Greek and Latin at the Beethoven Gymnasium in Bonn. At the Universities of Bonn and Munich he subsequently came to develop an interest in symbolic logic and, in particular, in the work of Gottlob Frege but also became familiar with the thought of Martin Heidegger and Max Scheler. It was at Oxford where he discovered Wittgenstein.
In recent years he has become increasingly preoccupied with political philosophy and specifically with what he calls “the diagnostic tradition in political philosophy” which he sees beginning with Marx and Nietzsche and extending to Carl Schmitt, Hannah Arendt, and Michel Foucault in the twentieth century.
He is currently at work on a book on political realism.