David Rockefeller his graduate studies, he received a Ph.D. from the University of Chicago in 1940. After completing his studies in Chicago, he became secretary to New York Mayor Fiorello La Guardia for eighteen months in a "dollar a year" public service position. Although the mayor pointed out to the press that Rockefeller was only one of 60 interns in the city government, his working space was, in fact, the vacant office of the deputy mayor. From 1941 to 1942, Rockefeller was assistant regional director of the United States Office of Defense, Health and Welfare Services. Rockefeller enlisted in the U.S. Army
John Sterling Rockefeller Yale University, where he was a member of the Scroll and Key Society. He graduated from Yale in 1928. In July 1928 Rockefeller, his Yale classmate Charles B. G. Murphy, and the Canadian collector and taxidermist Allan Moses went to Africa on an ornithological expedition to collect specimens for the American Museum of Natural History. The survey was funded by a grant of approximately $150,000 from the Rockefeller Foundation. The main goal of the expedition was to find and collect the rare Grauer's broadbill, which was known only by one 1908 specimen in the Walter Rothschild Zoological Museum in England,