Oyarzabal is a generalist in public and private international law. He taught a special course at The Hague Academy of International Law in 2020 and will teach the general course in 2029. He is the author of numerous publications in specialized journals both in Argentina and internationally.[2]
In 2021,Oyarzabal was elected as a member of the United Nations International Law Commission for the 2023–2027 term.[3] He was elected Chairperson of the Commission’s Drafting Committee in 2025.
Oyarzabal graduated as a lawyer in 1991 and as a notary public in 1992 from the National University of La Plata.[6] He joined the Argentine Foreign Service Institute,graduating in 1996. In 2005,he earned a Master of Laws (LL.M.) degree from Harvard University.[2]
Diplomatic Career
Oyarzabal joined the Argentine Foreign Service in 1997. He has held various roles,including serving in the Department of Parliamentary Affairs at the Foreign Ministry (1997–1998),the Consulate General in New York (1998–2004 and 2005–2007),the Legal Department of the Foreign Ministry (2007–2011 and 2016–2020),the Permanent Mission to the United Nations (2011–2016),and the Argentine Embassy in the Netherlands (2020-2025).[7][8]
In 2018,Oyarzabal was promoted to the rank of Ambassador Extraordinary and Plenipotentiary upon confirmation by the National Senate.
After serving as the Legal Adviser to Argentina’s Foreign Ministry,in 2019,he was appointed as Ambassador to the Netherlands by Decree No. 793/2019,issued by then-President Mauricio Macri.[9][8] He assumed his duties during the administration of President Alberto Fernández,[10] and continued to serve during the administration of Javier Milei.
In 2011,Oyarzabal served as a legal advisor in the first Advisory Opinion issued by the Seabed Disputes Chamber of the International Tribunal for the Law of the Sea. The opinion addressed the responsibilities and obligations of States sponsoring persons and entities engaging in activities in the Area.
Oyarzabal has taught international law at the University of La Plata and the University of Buenos Aires,among others. In 2020,he taught a course at The Hague Academy of International Law titled "The Influence of Public International Law on Private International Law in History and Theory and in the Formation and Application of Law".[18] He has been invited by the Academy’s Curatorium to deliver the general course in 2029.
He is the author of four books and more than 50 contributions to collective works and academic articles published in legal journals such as International and Comparative Law Quarterly,[19]European Journal of International Law,[20]Rivista di diritto internazionale,Rabels Zeitschrift für ausländisches und internationales Privatrecht,[21]Uniform Law Review,Revista Española de Derecho Internacional,University of Miami Inter -American Law Review,[22]Revista de Informação Legislativa, as well as in publications like the Encyclopedia of Private International Law[23] and the Argentine Yearbook of International Law.
Principal Publications
El contrato de seguro multinacional, Ábaco,Buenos Aires,1998.
La nacionalidad argentina, La Ley,Buenos Aires,2003.[24]
The Influence of Public International Law upon Private International Law in History and Theory and in the Formation and Application of the Law, Recueil des cours de l’Académie de droit international de La Haye,Vol. 428 (pp. 129-525),2023.[25]
Derecho internacional privado para diplomáticos,APSEN/CARI,Buenos Aires,2024.[26]
↑ Oyarzábal, Mario J. A. (2024). "Election of Judges of the International Court of Justice: Some Proposals for Reform Without Amending the Statute in Light of Recent Developments". International and Comparative Law Quarterly. doi:10.1017/S0020589324000034.
↑ Oyarzábal, Mario J. A. (2024). "The Hague Academy of International Law and Latin America". European Journal of International Law. 35 (4): 1079–1089. doi:10.1093/ejil/chae057.
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