Kate Mackintosh is the Executive Director of the UCLA Law Promise Institute Europe, based in The Netherlands. She served as the inaugural Executive Director of the Promise Institute for Human Rights in LA from August 2018 to July 2023.

She has held multiple roles at international criminal tribunals, including as Deputy Registrar for the International Criminal Tribunal for the former Yugoslavia, as well as prosecution appeals counsel, defence co-counsel and legal officer for Trial and Appeals judges.

For eight years, Kate advised Doctors without Borders on international law and human rights, and led advocacy efforts in over 30 countries around the world. She was part of post-conflict human rights field operations in Rwanda – working to rebuild the justice system after the genocide – and Bosnia, where she collaborated with Bosnian lawyers on strategies to use the courts to support economic and social rights.

In summer 2020, Kate was appointed deputy chair of the Independent Expert Panel for the Legal Definition of Ecocide, which issued its draft proposal in June 2021.

In January 2024, she was appointed to the International Council of Experts on the Investigation of Crimes Committed in Armed Conflict in Ukraine. The interrelationship of the protection of the environment with human rights and international criminal justice is a current focus of her work.

Margaretha Wewerinke-Singh is an Associate Professor of Sustainability Law at the University of Amsterdam and Adjunct Professor of Law at the University of Fiji. She practices at Blue Ocean Law, a boutique international law firm based in Guam.

Margaretha’s research and publications, including her book ‘State Responsibility, Climate Change and Human Rights under International Law’ (Hart Publishing 2019), have contributed significantly to the field of international law and climate justice. Forthoming work includes the Cambridge Handbook on Climate Change Litigation (edited with Sarah Mead), providing an overview of emerging best practice in climate litigation globally.

Margaretha has two decades of experience participating in international climate negotiations and related processes, advising and representing governments, NGOs and UN bodies. She has also advised on numerous climate litigation cases.

Currently, Margaretha serves as lead counsel for the Republic of Vanuatu in climate change advisory proceedings before the International Court of Justice and the Inter-American Court of Human Rights, leading a diverse team at Blue Ocean Law alongside Julian Aguon and Alofipo Fleur Ramsay. She also chairs the Loss and Damage Subcommittee of the Commission of Small Island States on Climate Change and International Law (COSIS) and served as counsel for COSIS in the advisory proceedings on climate change before the International Tribunal for the Law of the Sea.