Ludwig
Boltzmann

Vienna University (Physics Tree)


Paul
Ehrenfest

Leiden (Physics Tree)


Christian
Christiansen

Copenhagen University (Physics Tree)


Joseph John
Thomson

Cambridge (Physics Tree)




Niels
Bohr

Copenhagen University (Physics Tree)


Hendrik Antonie
Kramers

Leiden (Physics Tree)




Paul
Ehrenfest

Leiden (Physics Tree)


Niels
Bohr

Copenhagen University (Physics Tree)


Hendrik Antonie
Kramers

Leiden (Physics Tree)





Kees
van der Meer

Maastricht, Delft
(Options)

Kees van der MeerX