James D. Theberge was born in Oceanside, Long Island, New York circa 1931. He was awarded a master's degree in public administration by Harvard University in 1965. He was the economic adviser to the United States Embassy in Argentina from 1961 to 1964 and a senior economist for the Inter-American Development Bank in Washington from 1966 to 1969. From 1970 to 1975 he was director of the Latin American and Hispanic Studies Center at Georgetown University.
In 1975, he was appointed Ambassador to Nicaragua by President Ford, serving two years. President Reagan appointed him Ambassador to Chile in 1982. He served three years there.
He died of a heart attack on a visit to Jamaica in January, 1988. He was 57 years old.
James Theberge Papers, Georgetown University Library Booth Family Center for Special Collections, Washington D.C. https://findingaids.library.georgetown.edu/repositories/15/resources/10585 Accessed October 28, 2021.