Nicholas Tsagourias is professor of International Law at the University of Sheffield. He completed his law studies at the University of Thessaloniki in Greece, obtaining an LL.M. from the University of Bristol and his PhD from the University of Nottingham. His teaching and research interests are in the fields of international law and the use of force, international humanitarian law, international criminal law, cybersecurity United Nations Law. He is widely published in these fields. Recent publications are the edited collection Research Handbook on International Law and Cyberspace (Elgar 2015) and the authored book Collective Security: law, theory and practice (CUP 2013). He sits on the editorial board for the Journal of Conflict and Security Law (Oxford University Press) and is a member of the cyberterrorism study group of the International Law Association.