León Castellanos-Jankiewicz is Senior Researcher at the Asser Institute for International and European Law, and supervisor of the International Law Clinic on Access to Justice for Gun Violence at the University of Amsterdam Faculty of Law. His work focuses on the human rights implications of irresponsible arms trade and the history of public and private international law.
Castellanos-Jankiewicz regularly advises governments on arms export policies, and leads the project on 'Enabling Civil Society Efforts to Address the Misuse, Diversion and Abuse of Arms Exports in Latin America' within the Asser Institute, which was awarded a competitive grant by the U.S. State Department (2023-2025).
He has lectured in universities across Europe in English, Spanish and French. Overtime, he has written for print and online publications including El País, NRC and Just Security. 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 has held visiting positions at the University of Giessen (2023), the University of Cambridge (2017) and Harvard Law School (2015-16). He is the inaugural recipient of the David D. Caron Prize of the American Society of International Law (2019) and holds a PhD in International Law from the Geneva Graduate Institute.
'Can two lawsuits bring down the US gun industry?' ABC Radio National Australia, Rear Vision with Annabelle Quince, April 28, 2024.
'Can Mexico win its battle with US gun companies?', BBC World Service, ‘The Inquiry’, March 7, 2024, presented by Charmaine Cozier and produced by Jill Collins.
'Can 'lawfare' stop the war in Gaza?', The World, March 7, 2024, with Rebecca Collard.
'The Netherlands stops exporting weapons to Israel', Al Jazeera, February 20, 2024, with Abdullah Al-Shami.
'Mexico wins support for suit against gunmakers', China Daily, April 24, 2023, by Sergio Held.
'US arms companies under pressure from Mexico lawsuit', Al Jazeera, August 18, 2022, by Ann Deslandes.