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
Laurance Rockefeller involved in healthcare. Over the years his investment interests ranged also into the fields of aerospace, electronics, high temperature physics, composite materials, optics, lasers, data processing, thermionics, instrumentation and nuclear power. Venrock was a limited partnership investment company financed by members of the Rockefeller family and a number of the institutions with which the family had longstanding philanthropic ties, among them the Museum of Modern Art, Rockefeller University, and Memorial Sloan-Kettering Cancer Center. Rockefeller's major interest was in aviation; after the War, he became friendly with Captain Eddie Rickenbacker, who had triumphed in many dogfights over Europe. Rockefeller had learned