León Castellanos-Jankiewicz

León Castellanos-Jankiewicz is a Fellow at UNIDIR’s Conventional Weapons Programme and Senior Researcher at the Asser Institute for International and European Law and the University of Amsterdam Faculty of Law.

His work covers arms trade and weapons transfer policy, in particular human rights safeguards, due diligence and corporate accountability. He also studies the governance of global public goods, including through strategic litigation and supply chain resilience.

He has published in prominent academic venues, including the American Journal of International Law Unbound, the European Journal of International Law, the Business and Human Rights Journal and the Journal of the History of International Law. He is a listed expert in the Forum on the Arms Trade and serves on the Advisory Committee of Global Action on Gun Violence.

Previously, León was a Max Weber Postdoctoral Fellow at the European University Institute and held visiting fellowships at the University of Giessen, Harvard Law School and the Lauterpacht Centre for International Law, University of Cambridge. He holds a PhD in International Law from the Geneva Graduate Institute.