Nicholas Tsagourias is Professor of International Law at the University of Sheffield. His teaching and research interests are in the fields of international law and the use of force, international humanitarian law, international criminal law and cyber security. He is widely published in these fields. Nicholas sits on the editorial boards of the Journal of Conflict and Security Law (Oxford) and the Journal of the Use of Force and International Law (Hart Publishing). He has taught at many Universities in Europe and the USA. Dr Alasdair Morrison was an Army Legal Services officer until his retirement. During his thirty years' service he gained extensive experience in the operational law field both in the UK and overseas, including operational deployments and instructing and presenting on international humanitarian law.