[1] He later earned a master's degree in Administration and Public Affairs at the University of San Andrés (Argentina), and authored numerous articles and books on democratic participation.

[3] He entered public service upon his election in 1987 to the Buenos Aires City Council, and served in the Argentine Chamber of Deputies between 1991 and 1995.

Argüello served as host organizer in 1994 of the first official visit to Argentina of a British Parliamentary delegation since the Falklands War twelve years earlier, and later represented Latin America countries in the 1994-95 meeting of the Parliamentarians for Global Action.

[4] In 2003, Argüello was again elected to the Chamber of Deputies and he became Chairman of the Foreign Relations Committee, and in that capacity organized the office of the Parliamentary Monitor for the Falkland Islands (Observatorio Parliamentario Cuestión Islas Malvinas).

In November 2011, Arguello was designated as Ambassador of Argentina to the United States, and his credentials were formally accepted on 1 December.

• Inter-Parliamentary Union (IPU): Vice-President of the First Standing Committee on Peace and International Security Inter-Parliamentary Union (2006-2007) • Member of the Commission negotiating the External Debt of the Autonomous City of Buenos Aires (London, 2003) • Organizer of the first visit after the British Parliamentary conflict Falkland Islands (1994) • President of "Parliamentarians for Global Action" on behalf of the Latin American countries(1994–95) • Chairman of the Twinning Buenos Aires - Tel Aviv (Sister Cities, 1989) • Honors and awards received various international • Georgetown University (USA): Member of the Class Advisory Board School of Foreign Service.