He was succeeded in 1953 by Detlev Bronk , who broadened The Rockefeller Institute into a university that began awarding the PhD degree in 1954 .
Flexner retired in 1935 and was succeeded by Herbert Gasser .
Herbert Gasser was succeeded in 1953 by Detlev Bronk , who broadened The Rockefeller Institute into a university that began awarding the PhD degree in 1954 .
Flexner retired in 1935 and was succeeded by Herbert Gasser .