Claus-Dieter Ehlermann is Senior Counsel with Wilmer Cutler Pickering Hale & Dorr LLP in Brussels, former Professor of EC Law at the European University Institute in Florence, and former Director General in both the Competition Directorate and Legal Service of the European Commission. He has also served as Member and Chairman of the Appellate Body of the World Trade Organization.Mel Marquis is Part-time Professor of Law at the European University Institute and Professore a contratto at the University of Verona. He is a member of the editorial board of Mercato Concorrenza Regole. He has practised as an attorney in the United States and Belgium.