| 2005-2006 | Fellow, "European Foreign and Security Policy Studies Programme", founded jointly by Compagnia di San Paolo, Volkswagen Stiftung and Riksbankens Jubileumsfond |
| 2005 | Visiting Position, CERI-Sciences Po, Paris |
| 2006 | Visiting Position, Center for European Policy Studies, Brussels |
| 2008 | Visiting Fellow, European Union Institute for Security Studies |
| 2010 | Visiting Position, Center for Transatlantic Relations, SAIS-Johns Hopkins University, Washington, D.C. |
| 2007-2012 | Senior Research Fellow and Head, Research Cluster "European Foreign and Security Policy", Institute for European Studies, Vrije Universiteit Brussels |
| 2012-2013 | Fellow, Stiftung Neue Verantwortung, Berlin |
