Anne Marie L. Corominas worked with the Office of the Solicitor General under Philippine President Rodrigo Duterte's Administration, primarily on matters relating to the historic Award in the Philippines v. China arbitration case under the 1982 United Nations Convention on the Law of the Sea (UNCLOS). Previously, she worked with the Office of Supreme Court Senior Associate Justice Antonio T. Carpio, as a legal consultant primarily on international law issues and to support the outreach on the South China Sea dispute. Formerly from 2011 to 2014, she headed the Legal and International Affairs Office (with the rank of Assistant Secretary), ATC-PMC, at the Office of President Benigno Aquino III, where she spearheaded and conceptualized the UNCLOS arbitration case versus China; worked on the Peace Process, and strengthened Anti-Money Laundering, Counter-Terrorist Financing, and Anti-Corruption compliance, investigations and enforcement.
Prior to 2011, she worked in New York in several capacities, as a lawyer focusing on government enforcement defense, as a United Nations legal consultant, and as an ad hoc legal adviser of the Philippine Mission to the United Nations, helping negotiate for the establishment of the International Criminal Court. Her pro bono work included successfully devising a counterintuitive approach, and arguing for release/bail of the former United Nations Ambassador and Foreign Minister of Bosnia by obtaining the unprecedented support of the government requesting extradition. Bail was granted in the only United States and international case (2004 WL 1490219, S.D.N.Y., July 2004) of its kind. She has also represented the interests of the International Criminal Tribunal for the former Yugoslavia (ICTY) in Emergency proceedings before the U.S. Court of Appeals for the Second Circuit in Sacirbey v. Guccione, (Docket 06-5137-pr, April – June 2009) to obtain H.E. Mr. Sacirbey’s testimony as a crucial prosecution witness in the war crimes and crimes against humanity trial of The Prosecutor v. General Momčilo Perišić (the most senior officer of the Yugoslav Army under President Slobodan Milošević). Her first job after law school graduation was with the Lawyers Committee on Nuclear Policy, where she witnessed the process that led up to the 1996 International Court of Justice’s Advisory Opinion on Nuclear Weapons, and researched and wrote portions of the Model Nuclear Weapons Convention.