León Castellanos-Jankiewicz is Senior Researcher at the Asser Institute for International and European Law in The Hague, and supervisor of the International Law Clinic on Access to Justice for Gun Violence at the University of Amsterdam Faculty of Law. Currently, he focuses on the human rights implications of irresponsible arms trade.

His academic work has been published in the Max Planck Encyclopedia of International Procedural Law, European Papers and the Journal of the History of International Law. He is co-editor of International Law and Time: Narratives and Techniques (Springer, 2022).

Castellanos-Jankiewicz lectures regularly 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.

In 2019, Castellanos-Jankiewicz was awarded the inaugural David D. Caron Prize by the American Society of International Law. He is a member of the National Researchers System of Mexico (SNI) since 2022.

Previously, he was Max Weber Postdoctoral Fellow at the European University Institute, and held visiting positions at 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 speaking engagements you may contact him at L.castellanos@asser.nl.