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 D. Rockefeller Jr. the Cincinnati. In 1939, he was elected Fellow of the Royal Society under statute 12. The John D. Rockefeller Jr. Library at Brown University, completed in 1964, is named in his honor. John D. Rockefeller Jr. John Davison Rockefeller Jr. (January 29, 1874 – May 11, 1960) was an American financier and philanthropist who was a prominent member of the Rockefeller family. He was the only son among the five children of Standard Oil co-founder John D. Rockefeller and the father of the five famous Rockefeller brothers. In biographies, he is commonly referred to as "Junior" to distinguish him from