Otto
Struve

UC Berkeley




Marcel G.J.
Minnaert

Utrecht (Physics Tree)


Gerard P.
Kuiper

University of Arizona










Felix Christian
Klein

Universität Göttingen (Physics Tree)


Johannes Franz
Hartmann

Kuffner-Sternwarte


Richard
Schorr

University of Hamburg


Walter
Baade

Mount Wilson Observatory


Maarten
Schmidt

Caltech (Physics Tree)


Richard Frederick
Green

University of Arizona

Patrick B.
Hall

University of Arizona
(Options)

Patrick HallX