Ph.D.

In 1950, Serna earned his Ph.D. from the University of Havana, where he had befriended a classmate named Fidel Castro.

He eventually earned a Ph.D. in psychology and worked in various universities, though never for very long.

Borlaug studied forestry, and then obtained a Ph.D. in plant pathology.

Tuchman, of course, never earned a Ph.D.; nor was she ever affiliated with a university history department.

She never earned a Ph.D. or taught in a university history department.

He was educated at Gttingen, where he obtained the degree of Ph.D.

For this and his other graduate work his university later conferred upon him the degree of Ph.D.