After less than a semester at Harvard Law School, Negroponte joined the Foreign Service in 1960. He served at eight different Foreign Service posts in Asia (including the U.S. Embassy, Saigon), Europe and Latin America, and he also held important positions at the State Department and the White House. As a young Foreign Service officer—one of the few men in Washington who dared to openly disagree with Henry Kissinger's secret handling of the Vietnam peace talks—Negroponte attempted to convince his superior that any peace agreement negotiated without the consent of South Vietnam's leader Nguyen Van Thieu would be doomed to failure. Seymour Hersh claims in his book "The Price of Power" that Kissinger never forgave Negroponte, and, upon becoming Secretary of State, exiled him to Quito, Ecuador. Ironically, this was to be the beginning of Negroponte's long distinguished career as an ambassador. In 1981, he became the U.S. Ambassador to Honduras. From 1985 to 1987, Negroponte held the position of Assistant Secretary of State for Oceans and International Environmental and Scientific Affairs. Subsequently, he served as Deputy Assistant to the President for National Security Affairs, from 1987 to 1989; Ambassador to Mexico, from 1989 to 1993; and Ambassador to the Philippines from 1993 to 1996. As Deputy National Security Advisor to President Ronald Reagan, he was involved in the campaign to remove from power General Manuel Noriega in Panama. From 1997 until his appointment as ambassador to the U.N., Negroponte was an executive with McGraw-Hill.