He has authored numerous books and articles on international and European law.
Michel served as Chairman of the Committee of the Legal Advisor on Public International Law of the Council of Europe (CAHDI) and as Chairman of several other international committees and meetings, including the Chairman of the Workshop on Article 51 of the United Nations Charter in Light of Future Threats to International Peace and Security in Geneva in March, 2004.
[2] In that role he was closely involved in setting up the Special Tribunal for Lebanon.
[3][4] Ahead of the Vienna peace talks for Syria in 2015, Michel was appointed by United Nations Secretary-General Ban Ki-moon to head the working group on political and legal issues, in this capacity supporting United Nations Special Envoy for Syria Staffan de Mistura.
[5] Michell is a member of the Crimes Against Humanity Initiative Advisory Council, a project of the Whitney R. Harris World Law Institute at Washington University School of Law in St. Louis to establish the world's first treaty on the prevention and punishment of crimes against humanity.