University adminstration

• 2014 - 2019   Director, Georg-Simmel Center for Metropolitan Studies
• 2015 - 2017   Head of the Department of Geography, Humboldt-University
• 2010 - 2015   Forum Excellence Initiative, Humboldt-University
• 2009 - 2010   Task Force Excellence Initiative, Humboldt-University
• 2009 - 2014   Adjunct Head of the Geography Department, Humboldt-University
• 2005 - 2008   Vice-President for Academic Affairs and International Relations, University of Bremen
• 2003 – 2005   Adjunct Dean, Faculty of Social Sciences, University of Bremen

Geography - Editorial Boards

• Advisory Editorial Board "Environment and Planning D: Society and Space" (2016-2019)
• Editorial Board „Open Geography Journal“ (2007-2011)
• Editorial Advisory Board of the Journal  „Environment and Planning A“ (2006-2012)
• Editorial Board of the Journal  „Geography Compass“ (2006-2008)

Scientific Counselor

• Member of the Konvent of the Bundesstiftung Baukultur (since 2016)
• Scientific Counselor (Kuratoriumsmitglied) of the National Urban Policy Board of the Federal Ministy for the Environment, Nature Conservation, Building and Nuclear Safety (Kuratoriumsmitglied der "Nationalen Stadtentwicklungspolitik" des Bundesministeriums für Umwelt, Naturschutz, Bau und Reaktorsicherheit) (since 2014)
• Member of the Senate of the Leibniz-Association / Senatorin der Leibniz-Gemeinschaft (since 2014)
• 06/2012 Head of Jury for the "National Price for Integrated Urban Development" of the National Ministry in the category public welfare and civil society
• Scientific Counselor (Kuratorium) Schader-Stiftung, Darmstadt (2009-2014)
• Scientific Counselor (Beirat), City of Berlin (2009-2011)
• Head of Scientific Counsel (Vorsitzende Wissenschaftlichen Beirat) Leibnziz-Institut für Länderkunde (IfL), Leipzig (2009-2015)
• Scientific Counselor (Stellv. Vorsitzende Wissenschaftlichen Beirat) Institut für Landes- und Stadtentwicklungsforschung ILS GmbH, Dortmund (2008-2012)
• Scientific Counselor HafenCity Hamburg (2005-2014) 

Membership

• Member of the Akademie für Raumforschung und Landesplanung (ARL) (Academy for Spatial Research and Planning (ARL) (2010-2020)
• Member of Fachkommission Stadtentwicklung der Heinrich-Böll-Stiftung (2003 – 2006)
• Enquête-Kommission „Zukunft der Städte in NRW“ des Landtages Nordrhein-Westfalen (2001 – 2004)
• Verband der Geographen an deutschen Hochschulen (VGdH)
• Speciality Group "Stadtzukünfte" (VGdH)