Frederick Gymer
Parsons

London University, St. Thomas's Hospital Medical School






Raymond Arthur
Dart

University of the Witwatersrand




Oscar
Hertwig

Universität Berlin


Giuseppe
Levi

University of Torino


Hans
Spemann

Albert-Ludwigs-Universität Freiburg


Viktor
Hamburger

Washington University





Joel D.
Hahn

USC
(Options)

Joel HahnX