PJI Directors


Matthew Gillett

Dr. Matthew Gillett is a Senior Lecturer (Associate Professor) at the University of Essex. In 2022, he was appointed as a United Nations Special Mandate holder on the Working Group on Arbitrary Detention. Previously, he worked as a Senior Legal Officer at the Organisation for the Prohibition of Chemical Weapons (OPCW), a Trial Lawyer at the International Criminal Court and was previously a Legal Officer in the Office of the Prosecutor of the ICTY and the IRMCT. He has worked on several cases involving war crimes, crimes against humanity, and genocide. In 2016, he worked as a Human Rights Officer for the United Nations in Afghanistan. In 2007, he worked at the International Criminal Court in the Immediate Office of the Prosecutor and, before that in New Zealand as a criminal defence barrister and as a legal officer at the High Court. He has written several articles on international criminal law, including on crimes against the environment, and was a member of the New Zealand delegation to the Review Conference of the ICC in Kampala in 2010, where the amendments on the crime of aggression were adopted.

Yasmin Naqvi

Yasmin is an international lawyer with extensive experience in international organisations, courts and tribunals. She currently serves as Special Advisor to the Deputy Director-General of the OPCW. She previously held positions in the International Residual Mechanism for Criminal Tribunals, the OPCW, the International Criminal Tribunal for the former Yugoslavia, the International Criminal Court, the UN Office of the High Commissioner for Human Rights and the International Committee of the Red Cross. Yasmin has published widely on international humanitarian law, international law and terrorism, and international criminal law. She is a Visiting Professor in the International Law Department of the Graduate Institute of International and Development Studies and has taught at the American University’s Washington College of Law and the TMC Asser Institute summer programme, as well as providing lectures and workshops at various other institutions. She is a member of the Advisory Group on “Anchoring Accountability for Mass Atrocities” of the Oxford Programme on International Peace and Security.



Manuel Ventura

Manuel has worked as a Legal Officer at the IRMCT (Arusha Branch). He was previously a legal adviser in the Chambers of the STL. He has worked in the Office of the Prosecutor of the ICTY, primarily on the Karadzic and Hadzic cases, and in the Ruto (Kenya) Defence team at the ICC. He has published articles, blog posts, and book chapters on international criminal law and has taught at various institutions around the world. He is an Adjunct Fellow at Western Sydney University and has formerly clerked for Chief Justice Mogoeng Mogoeng of South Africa’s Constitutional Court and President Antonio Cassese at the STL.