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

• Advisory Board of the Institut for Urban and Regional Research (ISR), Austrian Academy of Sciences (since 2022)
• Konvent of the Bundesstiftung Baukultur (since 2016)
• National Urban Policy Board (Kuratorium) 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)
• Senate of the Leibniz-Association / Senatorin der Leibniz-Gemeinschaft (2014-2022)
• 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
• Kuratorium Schader-Stiftung, Darmstadt (2009-2014)
• Advisory Board, City of Berlin (2009-2011)
• Head of Advisory Board Leibnziz-Institut für Länderkunde (IfL), Leipzig (2009-2015)
• Deputy Head of Advisory Board Institut für Landes- und Stadtentwicklungsforschung ILS GmbH, Dortmund (2008-2012)
• Advisory Board HafenCity Hamburg (2005-2014) 

Membership

• Akademie für Raumforschung und Landesplanung (ARL) (Academy for Spatial Research and Planning (ARL) (2010-2020)
• 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)