Studied history, public law and legal history in Marburg (1994 Dr. phil.), a private lecturer at the University of Wuppertal (2004), adjunct professor of modern and contemporary history at the University of Wuppertal (2009), a lecturer at the University of Cologne (since 2007), trusted lecturer of the Friedrich Naumann Foundation for Freedom (since 2011), co-editor of the "Jahrbuch zur Liberalismus-Forschung" (since 2012). Chairman of Section 6 (Archives of Parliaments, Political Parties, Foundations and Associations) in the Association of German Archivists (Verband deutscher Archivarinnen und Archivare e.V.). (since 2017).