J R Spencer is Professor Emeritus of Law in the Law Faculty at the University of Cambridge and a Bye-Fellow at Murray Edwards College, Cambridge.

Angela Ward is a Référendaire in the Chambers of Advocate General Niilo Jääskinen at the Court of Justice of the European Union, and a Visiting Professor in the Law Faculty of Birkbeck College University of London.

Christophe Hillion is professor of European Law at the University of Leiden, and researcher at the Swedish Institute of European Policy Studies (Stockholm).