Gerardo Díaz Bartolomé, a career diplomat, was appointed deputy chief of mission at the Embassy of Argentina in Washington, DC in June 2018, where he had served as head for political affairs since 2016. As a diplomat, he served at the General Directorate of Malvinas and South Atlantic (2002–2003) and at the Deputy Foreign Minister’s Office (2004–2005) to be later appointed Private Secretary to the Foreign Minister between 2005 and 2008. In that capacity he was also involved in matters related to the South Atlantic, including as Financial Manager of the Argentine-British Joint Working Group for carrying out a feasibility study on the clearance of landmines in the Malvinas Islands between 2005 and 2008.

In August 2008, Díaz Bartolomé was assigned to the Permanent Mission of Argentina to the United Nations in New York where he served for six years. In that position he was Argentina’s Delegate to the Special and Decolonization Committee (UNGA Fourth Committee), being responsible for political and decolonization issues, including questions related to information. He was the G77 facilitator of UNGA resolutions regarding the mandates of the Department of Public Information of the UN Secretariat (2011 and 2013). During his assignment, he was also involved in Argentina’s leadership in the establishment of the Group of Friends of Spanish at the United Nations (A/67/998) in 2013. He was transferred to Buenos Aires in August 2014 to be head of bilateral and multilateral affairs at the Malvinas Islands Under Secretariat at Argentina's Ministry of Foreign Affairs, position he held until April 2016 when he was appointed Head of Political Affairs at the Argentine Embassy in Washington, DC.

Díaz Bartolomé holds a bachelor's degree in international affairs from the Universidad de Belgrano and a National Public Translator in English Language Degree from the Universidad Nacional de La Plata.