Prof. dr. Ernest Petrič je redni profesor mednarodnega prava in mednarodnih odnosov. Diplomiral je na Univerzi v Ljubljani (1960, Univerzitetna Prešernova nagrada), doktoriral leta 1965 na Univerzi v Ljubljani in bil habilitiran za rednega profesorja 15.4. 1982; dodatno se je izobraževal na Univerzi v Lundu (Švedska), na Dunaju pri prof. A. Verdrossu (1963-64), Univerzi v Solunu, na Akademiji za mednarodno pravo v Haagu, na Max Plank inštitutu v Heidelbergu idr.
Bil. 1978 nagrajen z nagrado sklada Borisa Kidriča za izvirnost in kvaliteto raziskovalnega dela; opravljal med drugim funkcijo dekana (1986-87) na Fakulteti za družbene vede; predaval kot gost na številnih tujih univerzah, in redno na Univerzi v Addis Abebi (1983-86) in Diplomatski akademiji na Dunaju (2008-09). Predava mednarodno pravo na Evropski pravni fakulteti (vključno z doktorskim študijem) in na Fakulteti za evropske in državne študije in je mentor pri diplomskih, magistrskih in doktorskih nalogah (disertacijah).
Bil je član republiške vlade S. R. Slovenije, odgovoren za probleme znanosti, državni sekretar v ministrstvu za zunanje zadeve, veleposlanik v Indiji, ZDA, Avstriji in stalni predstavnik (ambasador) pri OZN (New York, Dunaj) in pri OVSE in IAEA (tudi član sveta guvernerjev in njegov predsednik); član IPSA in ILA, član svetov in odborov številnih akademskih in raziskovalnih institucij, je član (in bivši predsednik) Komisije za mednarodno pravo (ILA) in bivši član Posvetovalnega odbora za nominacijo sodnikov (ACN) Stalnega mednarodnega kazenskega sodišča (ICC) v Haagu; bivši sodnik in predsednik Ustavnega sodišča Republike Slovenije; je višji svetovalec za ustavno pravna in mednarodna vprašanja Predsednika Republike Slovenije ; je član Komisije Sveta Evrope za vprašanja vladavine prava (t.i. Beneška komisija).
Je avtor 6 knjig o problematiki mednarodnega prava in mednarodnih odnosov, ki so izšle v slovenskem jeziku in (v po) ena v angleškem, italijanskem in albanskem prevodu. Znanstvena in strokovna bibliografija obsega cca. 350 enot (podrobno glej Cobis).
Dr. Ernest Petrič graduated from the Faculty of Law of the University of Ljubljana in 1960, winning the Prešeren University Award. He was also awarded PhD in Law from the same Faculty in 1965. After taking a position at the Institute for National Issues, he was first an Assistant Professor, then an Associate Professor, and finally a Full Professor of International Law and International Relations at what is presently the Faculty of Social Sciences of the University of Ljubljana. At this Faculty he was the director of its research institute, the Vice Dean, and the Dean (1986–1988). He has occasionally lectured at the Faculty of Law of the University of Ljubljana and as a guest also at numerous prestigious foreign universities. For three years (1983–1986) he was a Professor of International Law at the Faculty of Law in Addis Ababa.
He pursued advanced studies at the Faculty of Law of the University of Vienna (particularly with Prof. A. Verdross and Prof. S. Verosta), at the Max Planck Institute for Comparative Public Law and International Law in Heidelberg, at the Hague Academy for International Law, and at the Institute for International Law in Thessaloniki. He has been a member of numerous international associations, particularly the ILA (the International Law Association), the IPSA (the International Political Science Association), the Yugoslav Society of International Law, and currently the Slovene Society of International Law. He is a member and former chairman of the ILC (the International Law Commission), whose membership comprises only 34 distinguished international legal experts from the entire world, representing different legal systems and who are elected by the UN General Assembly.
In the ILC he actively participates in the work on codification and progressive development of international law. He is member of the Advisory Committee on Nominations for the judges of the International Criminal Court.
Between 1967 and 1972 he was a member of the Slovene Government (the Executive Council), which was presided over by Stane Kavčič, in which Dr. Petrič was responsible for the areas of science and technology. Subsequent to 1989 he was the ambassador to India, the USA, and Austria, and the non-resident ambassador to Nepal, Mexico, and Brazil. He was a permanent representative/ambassador to the UN (New York) and to the IAEA, UNIDO, CTBTO, ODC, and OECD (Vienna). From 1997 to 2000 he was a state secretary at the Ministry of Foreign Affairs. In 2006 and 2007 he presided over the Council of Governors of the IAEA (International Atomic Energy Agency). During the time of his diplomatic service he also dealt with important issues of international law, such as state succession with regard to international organizations and treaties, border issues, and issues concerning human rights and minority rights.
He has published numerous articles and treatises in domestic and foreign professional journals, and six books, four in the field of international law (Mednarodno pravno varstvo manjšin [The International Legal Protection of Minorities], Pravica narodov do samoodločbe [The Right of Nations to Self-Determination], Pravni status slovenske manjšine v Italiji [The Legal Status of the Slovene Minority in Italy]) together with prof. M. Pogačnik [Izbrane teme mednarodnega prava (Selected Topics of International Law)], and a fundamental work on foreign policy: Zunanja politika – Osnove teorije in praksa [Foreign policy – The Basics of Theory and Practice, published also in English and Albanian]. He has contributed papers to numerous conferences and seminars. He still occasionally lectures on international law at the European Faculty of Law in Nova Gorica, the Faculty of Social Sciences in Ljubljana, and the Faculty of State and European Studies in Brdo near Kranj. He commenced duties as judge of the Constitutional Court on 25 April 2008. He was President of the Constitutional Court from 11 November 2010 until 10 November 2013.