Felicitas Hillmann is head of the Research Unit Regeneration of Cities at the Leibniz Institute for Research on Society and Space, Germany and holds a professorship on Urban Transformation in International Perspective at Technische Universität in Berlin, Germany. Ton van Naerssen is an associate member of the Nijmegen Centre for Border Research (NCBR) at Radboud University Nijmegen, The Netherlands. Ernst Spaan is an assistant professor at Radboud Institute for Health Sciences, and an affiliated lecturer in courses on international migration and development at the Department of Geography, Planning and Environment, Radboud University Nijmegen, The Netherlands.