Gabriel Jackson was educated in the public schools of Mount Vernon, New York; he received his A.B. in History and Literature at Harvard College (1942), and served as a cartographer during World War II. He taught English and flute at the Putney School (1946-49) and, with the aid of a Fulbright Scholarship, received his doctorate from the University of Toulouse with a thesis on the Spanish sociologist Joaquin Costa (1952). His principal teaching posts were at Wellesley College, Knox College, and the University of California at San Diego. His principal writings (if he can be the judge of the matter) are The Spanish Republic and the Civil War (Princeton Press, 1965) and Juan Negrin, Physiologist, Socialist, and Spanish Republican War Leader (Sussex University Press, 2010).