| Since 01.2010 | Speaker of the Collaborative Research Centre (CRC) 884 "The Political Economy of Reforms", financed by the German Research Foundation (DFG). |
| Director of the Project B1 "The Domestic Foundation of Governmental Preferences over European Politics” in the CRC 884. | |
| Co‐Director of the Project C1 "Legislative Reforms and Party Competition” in the CRC 884. | |
| Director of the Project Z2 "Central Administration” in the CRC 884. | |
| Since 01.2009 | Director of the Project "Policy Change and Reform: The Determinants of Success and Duration of German Legislation between 1961 and 2005", financed by the German Research Foundation (DFG). |
| Since 09.2008 | Director of the Project "European Legislative Responses to International Terrorism (ELIT)" (with Dr. Daniel Finke), financed by the Fritz Thyssen Foundation. |
| 09.2007 – 08.2009 | Director of the Project "The Implementation of Community Law in the Member States", financed by the German Research Foundation (DFG). |
| 01.2003 – 12.2006 | Director of the Project "Domestic Structures and European Integration. A Multi‐stage two level game‐analysis of European constitution‐building" (with Professor Dr. Christophe Crombez, Professor Dr. Han Dorussen, Professor Dr. Madeleine Hosli, Professor Dr. Simon Hix, Professor Dr. Simon Hug, Professor Dr. Michael Laver, Professor Dr. George Tsebelis), financed by the 6th framework of the European Commission. |
| 01.2002 – 10.2009 | Co‐Director of the Research Group "Institutional Design of Federal Systems. Theorie and Empirics" (with Professor Dr. Jürgen von Hagen and Dr. Thomas Bräuninger), financed by the German Research Foundation (DFG). |
| 10.2001 – 09.2003 | Co‐Director of the Project "Domestic Preference Formation on Proposals of the European Commission: A Comparative Analysis of Cleavages and Interest Intermediation Patterns in Finland, Germany, the Netherlands and the United Kingdom" (with Professor Dr. Gerald Schneider), financed by the German Research Foundation (DFG). |
| 10.1999 – 09.2003 | Co‐Director of the Project "Explaining European Decision Making", (with Professor Dr. Frans Stokman), financed by the Dutch Science Foundation (NOW). |
| 10.1999 – 09.2001 | Co‐Director of the Project "The Relevance of Threats and Promises in EU Negotiations“ (with Professor Dr. Gerald Schneider), financed by the German Research Foundation (DFG). |
| 10.1999 – 08.2000 | Director of the Project "Governing in the Federal Republic of Germany", financed by the Federal Minister on Education and Research (BMBF). |
| 04.1999 – 09.1999 | Director of the Project "Coordination und Cooperation in international Multi Level Bargains", financed by the Mannheim Centre for European Social Research (MZES). |
| 03.1993 – 09.1997 | Director of the Project "Dynamics of European Integration", financed by the Mannheim Centre for European Social Research (MZES). |
| 06.1993 – 09.1996 | Co‐Director of the Project "The Negotiations of the Antarctic Liability Regime" (with Professor Dr. Rüdiger Wolfrum), financed by the Heidelberg Max‐Planck‐Institut for Public and International Law. |
| Collaborator in the Project of the European University Institute "Cabinets and Supporting Parties" (Director Professor Dr. Jean Blondel and Professor Dr. Maurizio Cotta). | |
| 03.1988 – 02.1992 | Collaborator in the Project "Collective Decision in the German, American and Japanese Labor Policy Domain" (Director Professor Dr. Franz Urban Pappi, Professor Dr. David Knoke, Professor Dr. Jeff Broadbent and Professor Dr. Yutaka Tsujinaka), financed by the VW Foundation and US National Science Foundation. |
| 07.1987 – 02.1988 | Collaborator in the Project "Research Deficits and Options in the German Federal Re‐public" (Director Professor Dr. Rudolf Wildenmann and Professor Dr. Ulrich Widmaier), financed by the Federal Minister on Education and Research (BMFT). |