Jean Piaget (; 9 August 1896 – 16 September 1980) was a French-speaking Swiss developmental psychologist and philosopher known for his epistemological studies with children. He was the eldest son of Arthur Piaget (Swiss) and Rebecca Jackson (French). His theory of cognitive development and epistemological view are together called "genetic epistemology".
Piaget placed great importance on the education of children. As the Director of the International Bureau of Education, he declared in 1934 that "only education is capable of saving our societies from possible collapse, whether violent, or gradual."
Piaget created the International Center for Genetic Epistemology in Geneva in 1955 and directed it until 1980. According to Ernst von Glasersfeld, Jean Piaget is "the great pioneer of the constructivist theory of knowing."