| 2013 | Organizer of the "6th Annual Conference on the Political Economy of International Organizations (PEIO)" at the Universities of Mannheim and Heidelberg in Germany. |
| 2012 | Organizer of the "6th Pan-European Conference on EU Politics” (for the ECPR Standing Group on the European Union) at the University of Tampere in Finland. |
| Since 2011 | Member of the Scientific Board of the Johann Wolfgang Goethe University Frankfurt/Main. |
| Official Representative of the University of Mannheim at the European Consortium for Political Research (ECPR). | |
| Member of the Executive Committee of the European Political Science Association (EPSA). | |
| Since 2009 | Director of the "Summer Institute on the Empirical Implications of Theoretical Models, EITM Europe" (University of Mannheim). |
| Member of the DAAD Review Board for Scholarships. | |
| Member of the Fulbright Review Board for Scholarships. | |
| 2009 | Director of the Workshop "Party Positions, Coalition Options and Policy Change in the 2009 Bundestag Election Year" (with Professor Dr. Thomas Bräuninger) at the Summer Academy of the German National Academic Foundation in Salem. |
| Chair of the George Tsebelis-Conference (with Dr. Marc Debus) "Reform Processes and Policy Change: How Do Veto Players Determine Decision-Making in Modern Democracies" (University of Mannheim). | |
| Since 2008 | Personal Tutor of the German National Academic Foundation. |
| Since 2007 | Member of the Editorial Board of "Political Analysis". |
| Member of the Editorial Board of "International Interactions". | |
| Since 2004 | Evaluator of the Exchange Program of the German Academic Exchange Program (DAAD). |
| 2004 | Director of the Workshop "Constitutional Politics of the European Union" (with Professor Dr. Simon Hug) at the Joint Sessions of the European Consortium for Political Research (ECPR). |
| 2003 | Chair of the Panel "Author meets Discussants: George Tsebelis Veto Players" at the 2nd General Conference of the European Consortium for Political Research (ECPR). |
| Director of the Workshop "Constitution‐building in the EU" at the 2nd General Conference of the European Consortium for Political Research (ECPR). | |
| Director of the Workshop "Europe Decides" at the Annual Meeting of the American Political Science Association (APSA). | |
| 2001 | Director of the "Summer School on Analytical Approaches to European Union Policy Making: Delegation and Implementation in the European Union" (London School of Economics). |
| Director of the Workshop "Decision‐making Approaches in the EU: An Empirical Evaluation of Competing Game‐Theoretic Models" at the 1st General Conference des European Consortium for Political Research (ECPR). | |
| 2000 | Director of the "Summer School on Analytical Approaches to European Union Policy Making: Bargaining, Legislation, and Bureaucratic Politics" (University of Konstanz). |
| Since 1999 | Member of the Editorial Board of "Political Studies". |
| Evaluator of the Research Program of the European Commission. | |
| 1999 | Director of the Workshop "Europe at Crossroads" at the Summer Academy of the German National Academic Foundation. |
| Director of the Workshop "Enlarging or Deepening – European Union at Crossroads" (with Professor Dr. Bernard Steunenberg) at the XXVII Joint Sessions of the European Consortium for Political Research (ECPR). | |
| Since 1998 | Member of the Editorial Boards of "European Union Politics". |
| 1998 | Director of the Workshop "Policy Networks" at the XVIII Sunbelt and 5th European International Conference on Social Networks. |
| 1997 | Director of the Summer School "Elites in Germany" of the German National Academic Foundation. |
| 1996 ‐ 1999 | Co-Editor of the Mannheim Yearbook for European Social Research. |