Professional activities (selected)

• Founder and Scientific Director of DECIDE bv (DECision Insights and Developments in Europe) (1995- )
  
  
• Member of the Board of Directors of the International Network for Social Network Analysis (INSNA) (1995- )
  
  
• Member of the European Academy of Sociology (2001- )
  
  
• Coordinator of the European Group on “Explaining EU Decision Making”, University of Groningen, Leyden, Nijmegen, Konstanz, Helsinki, Ann Arbor (1999- )
  
  
• Member of the Board of Research Institute and Graduate School SOM (Economy and Business School, University of Groningen) (2002- )
  
  
• Member of the Programmatic Steering Board of the Hague Institute for the Internationalisation of Law (HIIL) (2005- )
  
  
• Board Member of the Foundation for the Digital Monument for the Jewish Community (1999- )
  
  
• Member of the Council of the Rationality and Society Section of ASA (2002-2005)
  
  
• Member of the Scientific Board of the Dutch Documentation Center for Political Parties, Groningen (1992- )
  
  
• Scientific Director of the Groningen, Utrecht, Nijmegen Graduate and Research School "The Interuniversity Center for Social Science Theory and Methodology (ICS)" (1993-2002)
  
  
• Member of the Scientific Board of "Der Mannheimer Zentrum für Europäische Sozialforschung" (1992-1997)
  
  
• Member of the Supervising Board of GESIS, the German "Gesellschaft Sozial-wissenschaftlicher Infrastruktur-einrichtungen" (the coordinating organization of the Zentralarchiv Cologne, ZUMA Mannheim, and InformationsZentrum Sozialwissenschaften Bonn) (1990-1996)
  
  
• Member of the ICS Board (1986-1993)
  
  
• Editorial Board member of Journal of Mathematical Sociology (1992- ), Journal of Computational and Mathematical Organization Theory (1994- ), Rationality and Society (1999- ), and Connections (1998- )