David Rockefeller was born in 1915, the youngest child of John D. Rockefeller, Jr., one of the richest men in the United States, and the great patron of modern art Abby Aldrich Rockefeller. He graduated from Harvard College in the depths of the Depression, when the capitalist order, which his grandfather had helped to create, was under relentless attack. He studied at the London School of Economics and the University of Chicago, where he earned a Ph.D." "He worked briefly for New York City's flamboyant mayor Fiorello La Guardia before enlisting in the U.S. Army in 1942. His service as an intelligence officer in North Africa and France brought him into contact with many of the individuals who would soon dominate European politics and gave him a unique perspective on the events and personalities that eventuated in the "twilight struggle" of the Cold War." Rockefeller joined the Chase bank in 1946 as an assistant manager in the Foreign Department and rose through the ranks to become chairman of the board and chief executive officer. During that time, he struggled constantly to modernize and internationalize the bank's operations, often against a conservative and risk-averse corporate culture.