Ezequiel Heffes is a Senior Policy and Legal Advisor at Geneva Call, a humanitarian NGO that promotes respect of humanitarian norms by armed non-State actors. He holds an LLM in IHL and Human Rights from the Geneva Academy, and a law degree from the University of Buenos Aires School of Law. Ezequiel is currently finishing his PhD at the University of Leiden. Prior to joining Geneva Call, he worked for the ICRC in Colombia, Afghanistan and the Democratic Republic of Congo. He has widely published on different international law issues, being the author of Detention by Non-State Armed Groups under International Law (Cambridge University Press, 2022) and the co-editor of International Humanitarian Law and Non-State Actors. Debates, Law and Practice (Springer/Asser Press, 2020).