Wilhelm
Wundt

University of Leipzig


Nikolay Yakovlevich
Grot

Moscow State University


Robert Wilhelm Eberhard
Bunsen

Universität Heidelberg (Chemistry Tree)


Karl Ewald
Hasse

Universität Göttingen


Johannes Peter
Müller

Universität Berlin


Hermann
von Helmholtz

Physikalisch-Technische Reichsanstalt


Wilhelm
Wundt

University of Leipzig


Georgij
Chelpanov

University of Moscow

Gustav Gustavovich
Shpet

University of Moscow
(Options)

Lev Semionovitch
Vygotsky

Psychological Institute, Moscow

Irène Léopoldoff
Martin

University of Geneva

Irjö
Engeström

University of California

Alexandr Romanovich
Luria

University of Moscow

Alexander
Smirnov

(PsychTree)

Aleksey Nikolaevich
Leontiev

Moscow State University

Bluma Wulfovna
Zeigarnik

Moscow State University (PsychTree)

Gustav ShpetX