Jean Piaget


Early Years

Piaget published his first article at ten years old and became a museum curator by age fourteen. After finishing high school he studied zoology and went to the University of Neuchatel where he earned a Ph.D. in natural sciences.

A pioneer for cognitive theory and developmental psychology.


Piaget had a theory about cognitive development stages in children. He believed in four stages of development, known as schema, which began at infancy and went into adulthood. The stages, in order of youngest to oldest, are sensorimotor, preoperational, concrete operational, and formal operational.

Cognitive Development: the process of inquiring intelligence and increasingly advanced thought and problem-solving ability from infancy to adulthood

Fun Facts

He received the Erasmus (1972) and Balzan (1978) prizes and founded the international centre of Genetic Epistemology at Geneva. He also wrote 70 books and over 100 articles on human psychology.
"To express the same idea in still another way, I think that human knowledge is essentially active." -Jean Piaget