Sarah CASSELLA

Sarah Cassella is Professor of public law at Université Paris Cité, where she co-directs the Master’s programme in General International Law and heads international relations for the Law Department. Her research focuses on public international law, in particular the law of state responsibility, global risks such as climate change and pandemics, and the interaction between international economic law and environmental protection. She has published extensively on necessity in international law, climate change and international responsibility, including the monographs La nécessité en droit international (Martinus Nijhoff, 2011) and Global Risks and International Law. The Case of Climate Change and Pandemics (Brill, 2024). Her work also addresses international investment law and arbitration, notably through studies on due diligence standards, the necessity defence in investment disputes and the impartiality of arbitral tribunals.
She regularly acts as an expert for public authorities and international or non-governmental organisations, in particular on global health, climate change and the law of international responsibility. She has been heard on several occasions by the French National Assembly and has contributed to public debates in the media and specialised blogs such as Le Club des juristes and The Conversation. She is a member of the Council and Deputy Secretary-General of the French Society for International Law and has been a member of the “Human Rights in Times of Emergency” Committee of the International Law Association. She has held visiting positions and taught international humanitarian law and international economic law in Europe, the Middle East, Africa and the Americas.