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


William Wallace
Campbell

Lick Observatory


George E.
Hale

Yerkes Observatory (Astronomy Tree)


Bertil
Lindblad

Stockholm Observatory (Astronomy Tree)


Max
Wolf

Universität Heidelberg


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)



Tuomas
Lunttila

Univ. Helsinki
(Options)

Tuomas LunttilaX