Lorenzo Bosi is Assistant Professor at the Scuola Normale Superiore. His research interests include social movements and political violence. He has published in several academic journals and is co-editor of Dynamics of Political Violence (Ashgate, 2014), and co-author of The Dynamics of Radicalization: A Relational Comparative Perspective (Oxford University Press, 2015). He is chair of the standing group on Political Violence of the European Consortium of Political Research. Niall Ó Dochartaigh is Senior Lecturer in the School of Political Science and Sociology at the National University of Ireland Galway. He worked previously as a research officer with the International Conflict Research Centre of the University of Ulster and the United Nations University. He has published on conflict, negotiation, territory and new technologies in a range of journals and is the author of two other books: From Civil Rights to Armalites: Derry and the birth of the Irish Troubles (Cork 1997; Palgrave 2005) and Internet Research Skills (Sage 2002; 2007; 2012). He is convener of the Specialist Group on Peace and Conflict of the Political Studies Association of Ireland and a founding convener of the ECPR Standing Group on Political Violence. Further information is available at niallodoc.wordpress.com Daniela Pisoiu is Researcher at the Institute for Peace Research and Security Policy (IFSH) at the University of Hamburg. She is the author of Islamist Radicalisation in Europe: An Occupational Change Process (Routledge, 2011) and editor of the forthcoming book Arguing Counterterrorism: New Perspectives (Routledge 2014). She currently researches on subcultural aspects of radicalisation and political violence in a comparative perspective and is more broadly interested in social movement theory, terrorism and political violence, critical terrorism studies, political extremism and EU and US security policies.