Cecilia M. Bailliet is professor and director of the Masters Program in Public International Law at the University of Oslo. She has published extensively on transnational and cross-disciplinary issues within international law including general public international law, human rights, refugee law, constitutional law, counter-terrorism, gender/women's rights, solidarity, and peace.

Her authored and edited books include The Construction of the Customary Law of Peace: Latin America and the Inter-American Court of Human Rights (Edward Elgar 2021); The Research Handbook on International Law and Peace (Edward Elgar 2019), Promoting Peace Through International Law (OUP 2015), The Legitimacy of International Criminal Tribunals (CUP 2017), Non-State Actors, Soft Law, and Protective Regimes (CUP 2012), Cosmopolitan Justice and its Discontents (Routledge 2011), and Security: A Multidisciplinary Normative Approach (Brill 2009).

Bailliet has contributed lectures to the UN AudioVisual Library of International Law and was the chair of the Expert Advisory Group to the UN Independent Expert on the Right to International Solidarity in 2022.  She has served as consultant to national and international organizations, and her research has been the basis for the creation of guidelines in various institutions. She created the courses "Refugee and Asylum Law" and "The International Law of Peace" and is in charge of the Masters Level course on "Public International Law" at the Law Faculty. 

She holds a Doctorate in law from the University of Oslo in Norway and a combined JD/MA (honors) degree from The George  Washington University Law School and Elliott School of International Affairs .