Mattias Kumm is Inge Rennert Professor of Law, NYU School of Law and Research Professor for Global Public Law at WZB Social Science Research Center, Berlin. He works on basic issues of constitutional, European and international law as well as the philosophy of law. Beyond his current affiliations Kumm held professorial appointments among others at Harvard, Yale and the EUI. He is a founding Editor of Global Constitutionalism (CUP) and Jus Cogens (Springer).