Professor of Security and Military Studies and the Founding Chair of the Critical Security Studies Programme in the Doha Institute for Graduate Studies. He is the author of The De-Radicalization of Jihadists: Transforming Armed Islamist Movements (Routledge, 2009) and How ISIS Fights: Military Tactics in Iraq, Syria, Libya and Egypt (Edinburgh University Press, 2021), as well as the editor of Bullets to Ballots: Collective De-Radicalisation of Armed Movements (Edinburgh University Press, 2021). He served at the University of Exeter (UK) as a tenured faculty member for ten years (2008-2018). He also served as a senior consultant for the United Nations on security sector reform, counterterrorism, and de-radicalization issues (2009-2013; 2015). He co-authored the United Nations' Economic and Social Commission for West Asia's (UN-ESCWA) document on security sector reform during the transitional periods of the "Arab Spring." He was a Research Fellow at the Brookings Institution (2010-2015) and an Associate Fellow at the Royal Institute of International Affairs (Chatham House) in London (2015-2017). He has a Ph.D. degree from McGill University in Canada.