Dennis Dijkzeul is Professor of Conflict and Organizational Research at the Faculty of Social Sciences and the Institute for International Law of Peace and Armed Conflict (IFHV) at Ruhr University Bochum. He was the founding director of the Humanitarian Affairs Program at the School of International and Public Affairs at Columbia University. He has conducted research projects on crises and relief efforts in the Democratic Republic of the Congo, Guatemala, South Sudan, Nigeria and Afghanistan, and has worked as a consultant for UN organizations and NGOs. His research focuses on the management of international organizations and their interaction with local actors in humanitarian crises, particularly with marginalized and vulnerable groups. His most recent books are *The NGO Challenge for International Relations Theory* (with William DeMars); *The New Humanitarians in International Practice: Emerging Actors and Contested Principles* (with Zeynep Sezgin); “Diaspora Organizations in International Affairs” (with Margit Fauser); “International Organizations Revisited: Agency and Pathology in a Multipolar World” (with Dirk Salomons); and “Disability Inclusion in Humanitarian Crises: Robust Human Rights Norms?” (with Carolin Funke).