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
Rockefeller University dean of Hopkins' medical school and known as the dean of American medicine. Flexner retired in 1935 and was succeeded by Herbert Gasser. He was succeeded in 1953 by Detlev Bronk, who broadened The Rockefeller Institute into a university that began awarding the PhD degree in 1954. In 1965 The Rockefeller Institute's name was changed to The Rockefeller University. For its first six decades, the Institute focused on basic research to develop basic science, on applied research as biomedical engineering, and, since 1910—when The Rockefeller Hospital opened on its campus as America's first facility for clinical research—on clinical science. The