[2] He served in the United States Army during World War II.

From 1954 to 1958, Stone was a political officer in Paris at the Supreme Headquarters of Allied Powers in Europe.

Then in 1963, he was made deputy director of the Office of West European Affairs and studied at the Imperial Defence College in London.

[4] At the time of his appointment, Stone was the deputy US representative to the International Atomic Energy Agency.

[2] His grandfather, also Galen Luther Stone (1862–1926) was a financier and philanthropist, and a major benefactor of Wellesley College.