Assistant director of the Centre for Contemporary History (ZZF) and head of the “Visual History” project.
Researcher at the Centre for Contemporary History (ZZF), Potsdam and head of the field of press photography within the “Visual History” project.
Head of the central archive department at the Deutsches Museum.
Director of the Herder Institute and Professor of East Central European History at the Historical Institute of the Justus Liebig University, Gießen and at the interdisciplinary Gießen East European Centre (GiZo)
Director of the Georg Eckert Institute for International Textbook Research, Braunschweig and Professor of Modern and Contemporary History at the University of Braunschweig