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- 2004: Habilitation at the University of Trier and venia legendi for public law, international law and European law
- 1998: second state law examination in Brandenburg
- 1997: PhD in Law at the University of Trier
- 1994: first state law examination in Rheinland-Pfalz
- 1991: Certificat d’Études Politiques (CEP) des Institut d’Etudes Politiques Aix-en-Provence
- 1988-1993: law and political science studies in Bonn, Aix-en-Provence and Trier
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- Since 2016: Dean of the Faculty of Law of the Christian-Albrechts-University of Kiel
- Since 2011: Professor for public law with a focus on international law, European law und constitutional law as well as director of the Walther-Schücking-Institute for International Law at the University of Kiel
- 2004-2011: Professor for international and European law, foreign public law and comparatice public law at the University of St. Gallen, Switzerland
- 2001-2004: DFG-project management for young academics at the University of Trier
- 2000-2001: research assistant at the University of Trier
- 1998-2000: development and coordination of the interdisciplinary postgraduate-programme „European Studies“ in Berlin
- 1996-1998: trainee lawyer in Cottbus
- 1994-1996: research assistant at the University of Trier
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- international law (especially legal basis, international environment, culture and security law, human rights law and peaceful dispute settlement)
- European law (especially European external relations and security)
- constitutional law
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