|Professor Hans Friedenthal|
|(1870 - 1943)
As well as teaching at the University of Berlin, Friedenthal was head of the "experimental biology department" from 1919, and of the "anthropological department" between 1922 and 1923. At the Institute, he did research on the effects of sexual hormones as well as on sexual differences. He was also involved in training courses for doctors and medical students.
In 1924, he was made honorary professor at the University of Berlin where he founded an "Institute of Mankind Studies", did research on the natural history of mankind, worked as a characterologist and ran a marriage guidance council. He maintained close ties with the Institute through his publications in the journal "Die Ehe" ("Marriage") and as a member of the board of trustees.