is Professor for the History of Art and Architecture, ETH Zürich and member of the Zentrum Geschichte des Wissens, a competence center founded in 2005 by ETH Zürich and Universität Zürich. He studied art history, history and german literature in Geneva, Vienna and Berlin, and received his Ph.D. from the Freie Universität Berlin in 1993. He completed his habilitation treatise in 1999 at the ETH Zürich. He taught at Universities in Geneva, Basel and Zürich, the Ecole Supérieure d’Art Visuel, the ETH Zürich, the Kunsthochschule Berlin-Weissensee, der Universität der Künste Berlin and the Columbia University, New York.