Yusuf is Juris Doctor ( graduated Somali National University) and holds a Ph.D. in international law from the Graduate Institute of International Studies of Geneva. He also completed post-graduate studies in international law at the University of Florence in Italy.
Since 2009 he has been a judge at the International Court of Justice. Dr. Yusuf is the Founder and General Editor of the African Yearbook of International Law and is a Member of the Institut de droit international. He is one of the founders of the African Foundation for International Law, as well as the chairperson of its Executive Committee. In addition, Yusuf has authored several books and numerous articles on various aspects of international law as well as articles and op-ed pieces in newspapers on current Northeast African and Somali affairs. He is a member of the editorial advisory board of the Asian Yearbook of International Law, and a member of the Thessaloniki Institute of Public International Law and International Relations curatorium.