amanda Lazur -Theorist Jean Piaget By alazur1 Aug 9, 1896 Jean Piaget was born Aug 9, 1916 Recieved Ph D. degree from the University of Neuchatel Apr 1, 1921 Piaget began working in child psychology Apr 4, 1924 Piaget published "The Language and Thought of A Child" Apr 4, 1926 "The Child's Conception of the World" was published Sep 1, 1972 He defined the four stages of intellectual development Mar 1, 1974 "The Grasp of Consciousness" was published