Jean William Fritz Piaget born on Switzerland on 9 Agust, 1896. He was an experimental psychologis, philosopher and biologer. Now is considerer the father  of the genetic epistemology. He public  a lot of projects at the univercity of Zurich and worked as a teacher at the Alfred Binet school. After that he participated in the improvement of the C. I. Intelligence Test. When he returns to Switzerland he became director of the Rousseau Institute. At 1923 he married with Valentine Châtenay and had three childrens.  He died on 1980.

This genetic epistemologer is considerer one of the most important psychologits, because his importants contributions to the study of the development of the childrens and adolecent whit his theory about the cognitive development.  His childrens served as objet of many of his studys.

I think that his contributions to the psychology are really important because in his time had not a lot of information and studys about the development of the childrens, and his investigations served to continue the study of the childrens, and now a lot of his theorys are considered.