Paul D. Williams is Professor in the Elliott School of International Affairs at the George Washington University, USA. Between 2011 and 2019, Dr. Williams was a Non-Resident Senior Adviser at the International Peace Institute in New York where he managed the "Providing for Peacekeeping Project." Between 2011-2014 he served as a Visiting Professor at the Institute for Peace and Security Studies at Addis Ababa University in Ethiopia. His books include Understanding Peacekeeping (Polity Press, 3rd edition, 2021); Fighting for Peace in Somalia: A history and analysis of the African Union Mission (AMISOM), 2007-2017 (Oxford University Press, 2018); Security Studies: An Introduction (Routledge, 3rd edition, 2018); War and Conflict in Africa (Polity Press, 2nd edn, 2016), Providing Peacekeepers: The Politics, Challenges, and Future of UN Peacekeeping Contributions (Oxford University Press, 2013); and The Oxford Handbook of United Nations Peacekeeping Operations (Oxford University Press, 2015). He has served as a member of the editorial board on several scholarly journals: African Affairs, International Peacekeeping, Global Governance, and Global Responsibility to Protect.