Maisto earned his BS from the
Edmund A. Walsh School of Foreign Service at
Georgetown University, then earned his MA at the
University of San Carlos, Guatemala. After graduation, Maisto joined the
United States Department of State as a
Foreign Service Officer in 1968. Early postings included working with the State Department's
Information Agency in Argentina and Bolivia. He was later posted to positions at the US Embassies in the Philippines, Bolivia and Costa Rica. Maisto then served in postings as Director of the State Department's Office of Philippine Affairs (within the
Bureau of East Asian and Pacific Affairs), and then the Deputy Chief of Mission in Panama. In 1989, Maisto served as the Deputy U.S. Representative to the
Organization of American States, then became the Deputy Assistant Secretary of State for Central American Affairs (reporting to the
Assistant Secretary of State for Western Hemisphere Affairs) in 1992. ==United States Ambassador==