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Anders Severin
Donner
Stockholms observatorium

Karl Frithiof
Sundman
Univ. Helsinki


Yrjö
Väisälä
University of Turku


Östen
Bergstrand
University of Uppsala (Astronomy Tree)

Adriaan
van Maanen
Mount Wilson Observatory (Astronomy Tree)


Knut
Lundmark
University of Lund (Astronomy Tree)


Allvar
Gullstrand
Uppsala (Neurotree)

Östen
Bergstrand
University of Uppsala (Astronomy Tree)

Hugo von
Zeipel
University of Uppsala

Carl Wilhelm
Oseen
Nobel Institute for Theoretical Physics

William Wallace
Campbell
Lick Observatory

George E.
Hale
Yerkes Observatory (Astronomy Tree)


Bertil
Lindblad
Stockholm Observatory (Astronomy Tree)


Max
Wolf
Universität Heidelberg

James Hopwood
Jeans
Cambridge (FlyTree)

Edward Arthur
Milne
Oxford (MathTree)


Heinrich
Vogt
University of Jena


Vilhelm Friman Koren
Bjerknes
University of Oslo, Norway (Meteorology Tree)

Niels
Bohr
Copenhagen University

Oskar Benjamin
Klein
Stockholm University College


Svein
Rosseland
University of Oslo, Norway


Frederick Hanley
Seares
Mount Wilson Observatory



George E.
Hale
Yerkes Observatory (Astronomy Tree)


Hans
Kienle
Universität Göttingen

Otto
Heckmann
Hamburg Observatory


Heinrich
Siedentopf
Universität Tübingen (Astronomy Tree)


Hans
Elsässer
Heidelberg University (Astronomy Tree)



Kimmo
Lehtinen
Univ. Helsinki
(Options)

Kimmo LehtinenX