A Colombian, Uruguayan and French national, throughout her career, Mairée has served in various roles in the field of dispute resolution, including as arbitrator, counsel and secretary of arbitral tribunals, annulment committees and conciliation commissions.
She advises on public international law matters and is the chair of the Task Force on ISDS and Climate Change of the American Society of International Law.

From 2018 to 2023, she advised the Office of the Vice-Minister of Trade of Chile on foreign investment matters. During this period, she led Chile’s defense in investor-State disputes, represented the country in multilateral negotiations, including UNCITRAL’s Working Group III on ISDS Reform and ICSID rule amendments, participated in the negotiation of trade agreements and spearheaded the development of dispute prevention policies.

Between 2011 and 2018, as ICSID Team Leader and Senior Legal Counsel, she oversaw the administration of more than 60 cases, and served as secretary to tribunals, ad hoc committees and conciliation commissions in numerous proceedings. Between 2006 and 2011, Mairée was an associate at the international arbitration practice at White&Case LLP, in Washington D.C.

She has been an adjunct professor at American University, Washington College of Law, Georgetown University Law Center, and a visiting professor at the Heidelberg Center for Latin America and the Adolfo Ibáñez University in Chile. She co-edited Building International Investment Law: The First 50 Years of ICSID, among other publications, and frequently speaks at specialized conferences. She holds a law degree from Université Panthéon-Assas (Paris II), a master’s in international Economic Law from Université Panthéon-Sorbonne (Paris I), and an LL.M. from the University of Pennsylvania Law School. She is admitted to practice in New York.