His research specializes in international relations with a focus on Latin America. Among the topics he investigates are human rights, population uprooting, political violence and terrorism, and international cooperation and development. His work has appeared in Latin American Politics and Society, Terrorism and Political Violence, Beyond Law, Revista de Ciencia Política and Migración y Desarrollo. Feldmann has worked as a consultant for the International Development Research Centre and the United Nations High Commissioner for Refugees, and served as assistant to the Special Rapporteur on Migrant Workers and Their Families at the Inter-American Commission on Human Rights (2000-2006). He earned a PhD in political science at the University of Notre Dame.