"Jürgen Habermas currently ranks as one of the most influential philosophers in the world. Bridging continental and Anglo-American traditions of thought, he has engaged in debates with thinkers as diverse as Gadamer and Putnam, Foucault and Rawls, Derrida and Brandom. His extensive written work addresses topics stretching from social-political theory to aesthetics, epistemology and language to philosophy of religion, and his ideas have significantly influenced not only philosophy but also political-legal thought, sociology, communication studies, argumentation theory and rhetoric, developmental psychology and theology. Moreover, he has figured prominently in Germany as a public intellectual, commenting on controversial issues of the day in German newspapers such as Die Zeit.
However, if one looks back over his corpus of work, one can discern two broad lines of enduring interest, one having to do with the political domain, the other with issues of rationality, communication, and knowledge. (In what follows, unnamed citations refer to works by Habermas; quotations are from the English editions, where available.)"
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Thanks to Gary E Davis for the pointer.