Profile of Invited Expert “Ruys”

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Full Name
Tom Ruys, Ph.D., LL.M.
Professor of international law
Ghent Rolin-Jaequemyns International Law Institute (GRILI)

Prof. dr. Tom Ruys is a professor of international law at Ghent University (tenure-track). He holds a doctoral degree from the University of Leuven (2009) and is a member of the Brussels bar (Stibbe). He was a visiting researcher at Yale Law School in 2008 and a visiting fellow at the Cambridge Lauterpacht Centre in 2016. Tom was previously awarded the Francis Lieber Prize (2015 article prize and 2011 book prize) as well as the Francis Deák Prize of the American Society of International Law. He is the author of several publications, including the monograph “‘Armed Attack’ and Article 51 of the UN Charter: evolutions in customary law and practice” (Cambridge Series in International and Comparative Law, 2010). His writings have appeared inter alia in the American Journal of International Law, the International and Comparative Law Quarterly, the Leiden Journal of International Law, the Chinese Journal of International Law and the Journal of Conflict and Security Law. Tom is a member of the International Law Association’s Committee on the Use of Force and the ILA Study Group on Sanctions. He is co-editor-in-chief of the Journal on the Use of Force and International Law (JUFIL, Routledge), vice-director of the Military Law and Law of War Review and a member of the editorial board of the Revue belge de droit international.

Selected Citations to Published Materials
  • Tom Ruys, Oliver Corten, & Alexandra Hofer (eds.), The Use of Force in International Law—A Case-Based Approach (OUP, forthcoming Apr. 2018);
  • Tom Ruys, Criminalizing Aggression: How the Future of the Law on the Use of Force Rests in the Hands of the ICC, EJIL (forthcoming 2017), available online;
  • Tom Ruys, Justiciability, Complementarity and Immunity: Reflections on the Crime of Aggression, 13 Utrecht L. Rev. 18 (2017), available online;
  • Tom Ruys, The Meaning of "Force" and the Boundaries of the Jus ad Bellum: Are "Minimal" uses of Force Excluded from UN Charter Article 2(4)?, 108 Am. J. Int’l L. 159 (Apr. 2014), paywall;
  • Tom Ruys, "Armed Attack" and Article 51 of the UN Charter: Evolutions in Customary Law and Practice (Cambridge U. Press Jan. 2011), paywall.


Member for
6 years 26 weeks