Professor Tugendhat was an early and influential proponent of "analytic" style linguistic philosophy in Germany, but also wrote influentially on Husserl and Heidegger. He taught at a number of German universities during his career, including Heidelberg and the Free University of Berlin. There is an obituary in English here. Comments are open for remembrances from those who knew Professor Tugendhat or for those who wish to comment on the significance of his work.
UPDATE: A statement of condolences regarding Professor Tugendhat from the German President! (Thanks to Christian Beyer for the pointer.)