Bùi Diễm 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.

Trần Trọng Kim, courtesy name Lệ Thần, was a Vietnamese scholar and politician who served as the Prime Minister of the short-lived Empire of Vietnam, a state established with the support of Imperial Japan in 1945 after Japan had seized direct control of Vietnam from Vichy France toward the end of World War II. He was an uncle of Bùi Diễm.