Johannes Glückler is Professor of Economic and Social Geography and Fellow of the Marsilius Center of Advanced Studies at Heidelberg University. His research follows a relational perspective and builds on theories of organization, networks and institutions in the analysis of the space economy. He serves on several boards of journals in the field of economic geography as well as a partner of the Schader Foundation in the area of social network research. As part of the European ERASMUS Teaching Mobility program, he is a regular visiting professor at the University of Salamanca. He is also co-founder of the M.Sc. Governance of Risks and Resources at the Heidelberg Center for Latin America in Santiago de Chile. He recently co-authored, with Harald Bathelt, The Relational Economy, Oxford University Press, 2011. Emmanuel Lazega is professor of sociology at the Institut d’Etudes Politiques de Paris, a membre of the Centre de Sociologie des Organisations (CNRS), and current president of the European Academy of Sociology. His current research focuses on the dynamics of multilevel (individual and organizational) networks. He recently co-edited, with Tom A.B. Snijders, Multilevel Network Analysis for the Social Sciences: Theory, Methods and Applications, Springer, 2016.  Ingmar Hammer is research associate at the University of Heidelberg. He studied geography, business and GIS at the University of Stuttgart and wrote his diploma thesis on innovation networks in biotechnology. Furthermore, Ingmar Hammer has worked in various companies in the high-tech sector. Among his research interests are innovation and business networks, methods of the social network analysis and their application to the analysis of business networks as well as geographies of services.