Bùi Diễm (1 October 1923 – 24 October 2021) was South Vietnam's ambassador to the United States under President Nguyễn Văn Thiệu from 1965 to 1972, then re-appointed ambassador-at-large and served until 1975. He played a key role in the last desperate attempt to secure US$700 million in military aid to defend South Vietnam against the North in 1975. Bui Diem was born in Phủ Lý, Hà Nam, French Indochina, on October 1, 1923. He was the nephew of Trần Trọng Kim, who served as the Prime Minister of Emperor Bảo Đại. Diem had been active in politics since he studied at Pomelo School and joined the Nationalist Party of Greater Vietnam in 1944 through the introduction of a friend. At age 31, Bui Diem became a member of the delegation to the 1954 Geneva Conference. He also founded the Saigon Post newspaper in South Vietnam, which operated from 1963 to 1975, and was a member of the negotiating team appointed by President Nguyễn Văn Thiệu at the Paris Peace Accords. In 1973, concerned about the threat of the United States Congress to cut off spending for the Vietnam War, Diem was sent by President Thieu as a delegation to Washington to set out South Vietnam's position on the peace talks. Bui Diem and Anna Chennault acted as intermediaries between President Thieu and Richard Nixon in the "Anna Chennault Affair" to delay peace negotiations in Paris, creating an opportunity to help then-republican candidate Nixon win the 1968 United States presidential election. President Johnson knew this entire plan, he forced the FBI, CIA, and NSA to monitor Diem and Anna's activities. For his part, Bui Diem repeatedly denied making any deals with the Nixon campaign to sabotage the peace talks. After the fall of Saigon in 1975, he settled in the United States, living in Rockville, Maryland, and running a Jewish delicatessen. He wrote articles and worked for the RAND Corporation, then borrowed money and was a part- owner of Goldberg's Delly in downtown Washington until 1982. He was a scholar at the Woodrow Wilson International Center for Scholars and at the American Enterprise Institute, as well as a research professor at George Mason University. Bui Diem was interviewed by Stanley Karnow for Vietnam: A Television History, where he recounts in a stunning allegation that Lyndon B. Johnson had unilaterally deployed Marine ground troops into South Vietnam without consulting the South Vietnamese government. Bui Diem was the author of the book In the Jaws of History (1987), and appeared as a witness in Ken Burns's series The Vietnam War, produced by PBS in 2017. He had three children, two daughters and a son. Diem spoke fluent English and French. He died in Rockville, Maryland, on 24 October 2021, at the age of 98.