Pérez de Cuéllar joined the Ministry of Foreign Affairs in 1940 and the diplomatic service in 1944, serving subsequently as Secretary at Peru's embassy in France, where he met and married his first wife in 1947, Yvette Roberts. He also held posts in the United Kingdom, Bolivia, and Brazil, and later served as ambassador to Switzerland, the Soviet Union, Poland, and Venezuela. From his first marriage, he has a son, Francisco, born in Paris, and a daughter, Águeda Cristina, born in London. He was a junior member of the Peruvian delegation to the first session of the General Assembly, which convened in London in 1946, and a member of the delegations to the 25th through 30th sessions of the Assembly. In 1971, he was appointed permanent representative of Peru to the United Nations, and he led his country's delegation to all sessions of the Assembly from then until 1975. In 1973 and 1974, he represented his country in the Security Council, serving as its President at the time of the events in Cyprus in July 1974. On September 18, 1975, he was appointed Special Representative of the Secretary-General in Cyprusa post he held until December 1977, when he rejoined the Peruvian Foreign Service. On October 29, 1975, in Cyprus, Mr. Pérez de Cuéllar married his second wife, the former Marcela Temple Seminario with whom he had no children. On February 27, 1979, he was appointed as United Nations Under-Secretary-General for Special Political Affairs. From April 1981, while still holding this post, he acted as the Secretary-General's Personal Representative on the situation relating to Afghanistan. In that capacity, he visited Pakistan and Afghanistan in April and August of that year in order to continue the negotiations initiated by the Secretary-General some months earlier.
United Nations Secretary-General
On December 31, 1981, Pérez de Cuéllar succeeded Kurt Waldheim as Secretary-General and was re-elected for a second term in October 1986. During his two terms, he led mediations between Great Britain and Argentina in the aftermath of the Falklands War and promoted the efforts of the Contadora Group to bring peace and stability to Central America. He also interceded in the negotiations for the independence of Namibia, the conflict in Western Sahara between Morocco and the Polisario Front, the war between Croatian forces seeking independence and the Yugoslav People's Army as well as local Serb forces, and the Cyprus issue. In 1986 he presided over an international arbitration committee that ruled on the Rainbow Warrior incident between New Zealand and France. In 1983, he initiated the World Commission on Environment and Development in order to unite countries to pursue sustainable development. Shortly before the end of his second term, he rejected an unofficial request by members of the Security Council to reconsider his earlier decision not to run for a third term, shortened to two years, as a search for his successor had not, as of then, yielded a consensus candidate. A suitable candidate, Boutros Boutros Ghali of Egypt, was agreed upon in late December 1991, and his second term as Secretary-General concluded, as scheduled, on December 31, 1991.
On July 22, 2005, Pérez de Cuéllar suffered a heart attack and was admitted to a hospital in Paris; he was released on July 30. On June 19, 2017, with a lifespan of 35,581 days he surpassed Alfredo Solf y Muro in terms of longevity and had the longest life of any Prime Minister in Peru's history. Pérez de Cuéllar died in Lima on March 4, 2020, at age 100.
