León Castellanos-Jankiewicz is Senior Researcher at the Asser Institute for International and European Law and the University of Amsterdam Faculty of Law, and a Fellow at the United Nations Institute for Disarmament Research (UNIDIR).

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, and the Journal of the History of International Law. He is a listed expert in the Forum on the Arms Trade and sits on the Advisory Committee of Global Action on Gun Violence.

Previously, he was 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.

For press inquiries and other engagements you may contact him at L.castellanos@asser.nl.