Julius
Mac Leod

Ghent University (Chemistry Tree)


Leonard Salomon
Ornstein

Utrecht (Physics Tree)


Paul
Ehrenfest

Leiden (Physics Tree)


Marcel G.J.
Minnaert

Utrecht (Physics Tree)




Anton
Pannekoek

Amsterdam








Robert Grant
Aitken

Lick Observatory


Gerard P.
Kuiper

University of Arizona




John Krom
Rees

Columbia


Harold
Jacoby

Columbia






George E.
Hale

Yerkes Observatory








George E.
Hale

Yerkes Observatory






David
Gill

Royal Observatory at Cape of Good Hope




Elis
Strömgren

Copenhagen University (Physics Tree)


Wilhelm Friedrich
Ostwald

Leipzig University (Chemistry Tree)


Hans Emil
Lau

Urania observatory, Copenhagen (Physics Tree)


Karl
Schwarzschild

Astrophysical Observatory Potsdam (Physics Tree)












George A.
Van Biesbroeck

Yerkes Observatory




Otto
Struve

UC Berkeley




Rudolf
Lipschitz

Universität Bonn (Physics Tree)


Julius
Plücker

Universität Bonn (Physics Tree)


Rudolf Friedrich Alfred
Clebsch

Universität Göttingen (Physics Tree)


Felix Christian
Klein

Universität Göttingen (Physics Tree)


Friedrich Karl
Hayn

University of Königsberg (Physics Tree)


Heinrich
Bruns

Universität Leipzig (Physics Tree)


Johannes Franz
Hartmann

Kuffner-Sternwarte


Hugo
von Seeliger

Universität München




Richard
Schorr

University of Hamburg


Walter
Baade

Mount Wilson Observatory


Maarten
Schmidt

Caltech (Physics Tree)

Bruce A.
Peterson

ANU
(Options)

Boudewijn F.
Roukema

Nicolaus Copernicus University

Zbigniew
Buliński

Nicolaus Copernicus University

Jan Jakub
Ostrowski

Nicolaus Copernicus University

Bruce PetersonX