She has been described as “the foremost expert on state immunity” and is a leading scholar on international dispute settlement and human rights (including the right to a fair trial, freedom of expression, and the prohibition of genocide and modern slavery). She is the founding co-director of the King’s Centre on International Governance and Dispute Resolution and a member of the Public International Law Advisory Panel of the British Institute of International & Comparative Law.
Philippa has held positions in the Presidency of the International Court of Justice, the Office of the Prosecutor at the International Criminal Court and in United Nations Headquarters. Her publications include The Right to a Fair Trial in International Law (OUP 2020, with A Clooney) and Oppenheim’s International Law: United Nations (2017, with R Higgins, D Akande, S Sivakumaran and J Sloan), both of which have been awarded the American Society of International Law’s Certificate of Merit. Her treatise, The Law of State Immunity (2015, with H Fox) has been cited by leading courts around the world.