Dr Orakhelashvili’s research focuses on all areas of public international law. He is an author of Peremptory Norms in International Law (OMIL, OUP 2006, paperback 2008, 657 pages), which is the updated and expanded version of his doctorate defended at Cambridge University in 2004, and constitutes the first comprehensive study of the complex phenomenon of peremptory norms in the international legal system. He has also authored The Interpretation of Acts and Rules in Public International Law (OMIL, OUP 2008, 620 pages), which is first and so far the only comprehensive work on interpretation encompassing not only international treaties but also other international legal acts such as unilateral declarations, reservations, Security Council resolutions and declarations accepting the International Court’s jurisdiction. Most recently he published the first ever comprehensive monograph on Collective Security (OUP, 2011), an original study of the operation of universal and regional security institutions and their dynamic mutual interaction. Dr Orakhelashvili has also contributed about 80 articles and chapters to leading journals, yearbooks and edited collections. His work has been repeatedly cited by judges in national and international courts, for instance in 2004 by Mance LJ (as he then was) in the Court of Appeal decision on Jones v Saudi Arabia, as well as the Australian High Court, European and Inter-American Courts of Human Rights.