William Egan Colby was born in Saint Paul, Minnesota, in 1920. His father, Elbridge Colby, who came from a New England family with a history of military and public service, was a professor of English, an author, and a military officer who served in the Army and in university positions in Tientsin, China; Georgia; Vermont; and Washington, D.C. Though a career officer, Elbridge Colby's professional pursuits focused less on strictly military activities and more on intellectual and scholarly contributions to military and literary subjects. Elbridge's father, Charles Colby, had been a professor of chemistry at Columbia University but had died prematurely, leaving his family largely without money. William's mother, Margaret Egan, was from an Irish family in St. Paul active in business and Democratic politics. With his Army father, William Colby had a peripatetic upbringing before attending public high school in Burlington, Vermont. He then attended Princeton University and graduated with an A.B. in politics in 1940 after completing a 196-page long senior thesis titled "Surrender -- French Policy toward the Spanish Civil War." He then studied at Columbia Law School the following year. Colby recounted that he took from his parents a desire to serve and a commitment to liberal politics, Catholicism, and independence, exemplified by his father's career-damaging protest in The Nation magazine regarding the lenient treatment of a white Georgian who had murdered a black U.S. soldier also based at Ft. Benning.