Professor of Law and Director, Centre for International Courts and Tribunals, University College London; Barrister and Queen's Counsel, Matrix Chambers; legal adviser and counsel before national and international courts and tribunals. International arbitrator. Regular commentator for radio and television. Author of articles and books, including: Principles of International Environmental Law (2003); Lawless World (2005); Torture Team (2008); Bowett's Law of International Institutions (2009).