Pedro Villagra Delgado is Argentina's Sherpa for the G-20. He has participated and headed numerous Argentine delegations to international negotiations and conferences, as well as being an expert for the International Atomic Energy Agency (AIEA) in Vienna on nuclear matters, safeguards, and nonproliferation. He is also counselor at the Argentine Council of International Relations (CARI). From 2016 to 2017, Delgado served as chief of cabinet of the Foreign Minister and later Deputy Foreign Minister. He served as non-resident ambassador of Argentina to Papua New Guinea from 2014 to 2016, as well as to the Fiji Islands from 2007 to 2016. He was also ambassador to the Commonwealth of Australia from 2005 to 2016. Villagra Delgado was a professor of public international law from 1978 to 2005 and lecturer on international relations from 2004 to 2005 at the University of Buenos Aires. He graduated with honors from the Universidad Nacional de Tucuman Law School and received his Master in Laws in public international law from King’s College, University of London.