studied Literary Studies and History at the Universities of Hamburg and Hannover. His dissertation was on »Halbweib und Maskenbildner. Subjektivität und schwule Erfahrung im Werk Josef Winklers« (1993). He taught at the Universities of Hannover and Siegen, before he became a member of the collaborate research center on »Ästhetische Erfahrung im Zeichen der Entgrenzung der Künste« at Freie Universität Berlin in 1993.
is an art historian and the head of the Interdisciplinary Center »Art and Esthetics« at Freie Universität Berlin. His research focus is on French art of the 19thand early 20thcentury, US-American art of the post-1945 era and on modern aesthetics. He is also head of the subordinated project of »Mittelbarkeit und Unmittelbarkeit in der Kunst der Moderne« as part of a collaborate research project funded by the »Deutsche Forschungsgemeinschaft« (DFG) on »Ästhetische Erfahrung im Zeichen der Entgrenzung der Künste«, a project he also supervises.