Daniel Thym is Professor of Public, European and International Law and Co-Director of the Research Centre on immigration and Asylum Law, University of Konstanz, and Book Review Editor, European Law journal. Francis Snyder is CV Starr Professor of Law and Co-Director, Centre for Research on Transnational Law, Pekins University Sclrool of Transnational Law ; Visiting Professor, London School of Economics ; Emeritus Professor, Université Paul Cézanne Aix-Marseille III ; EU Jean Monnet Chair ad personam ; Editor-in-Chief, European Law journal.