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.
is an art historian and curator based in Berlin. She is associate of the Collaborative Research Centre »Aesthetic Experience and the Dissolution of Artistic Limits« at Freie Universität Berlin and has curated numerous exhibitions and art projects.