Cyril
Burt

University of London


Francis
Galton

Cambridge


Wilhelm
Wundt

University of Leipzig




Raymond B.
Cattell

University of Illinois




Alfred
Binet

Sorbonne




Édouard
Claparède

Rousseau Institute


Jean
Piaget

University of Geneva


Jean
Piaget

University of Geneva


Bärbel
Inhelder

University of Geneva


Ernst
Boesch

University of Saarland


Paul
Baltes

Max Planck Institute for Human Development (Berlin)

Roger
Dixon

University of Alberta
(Options)

Allison A. M.
Bielak

Colorado State (Gerontology Family Tree)

Odette N.
Gould

Mount Allison University (Gerontology Family Tree)

Roger DixonX