holds the Chair in Public Law, European Law, Public International Law, Comparative Law and Law and Politics at the University of Bielefeld (Law Faculty). He studied Law, Political Science and History at the Universities of Bonn and Munich and at the Institut d’Études Politiques de Paris (Sciences-Po). LL.M. (Yale Law School) 1995; Dr. iur. (University of Munich) 1999; Habilitation (Humboldt University) 2005. He was Visiting researcher at Harvard Law School 2000; Visiting lecturer at University of Warsaw since 2000; Visiting professor at Paris 1 (Panthéon-Sorbonne) 2007 and at Paris 2 (Panthéon-Assas) 2010. Professor Mayer was Counsel to the German Parliament in the Treaty of Lisbon-trial at the German Constitutional Court in 2008-2009, and is currently counsel in the case pending on the Euro stabilization mechanism. (His fellowship was made possible with the support of German Academic Exchange Service-DAAD and Deutsches Haus at NYU).