Wilhelm
Wundt

University of Leipzig


Willy
Hellpach

Heidelberg University (PsychTree)


Wilhelm
Witte

University of Regensburg, Germany






John S.
Werner

UC Davis
?


Fred
Attneave

University of Oregon


Richard K.
Olson

CU Boulder


Bärbel
Inhelder

University of Geneva


Jean
Piaget

University of Geneva


Ernst
Boesch

University of Saarland


Paul
Baltes

Max Planck Institute for Human Development (Berlin)


Reinhold
Kliegl

University of Potsdam

Ulrich
Mayr

University of Oregon
(Options)

Ulrich MayrX