129 years ago today, on August 9, 1896 (July 1, 1896 in the lunar calendar), the famous child psychological development scientist Jean Piaget was born. Jean Piaget (1896-1980) was a Swiss psychologist and founder of genetic epistemology. He was first a biologist, later a philosopher of genetic cognition, and a developmental psychologist famous for his research on child psychology. The order of Piaget's identities represents Piaget's lifelong journey of intellectual activities. Piaget was born on August 9, 1896 in Nachart, Switzerland. His father was a university professor. In 1915, he obtained a bachelor's degree in biology from the University of Nashatt, and in the next three years, he studied philosophy and science courses; in 1918, he obtained a doctorate in natural sciences from the University of Nashatt. He was only 22 years old. In 1919, he went to Paris to study and entered the field of psychology; he studied psychopathology and philosophy of science at the University of Paris, and published three books: "The Origin of Children's Intelligence","Children's Construction of Reality" and "The Formation of Children's Symbolism"; He was also hired as UNESCO Director of Education. Such conditions made it easy for Piaget to later extend his own theory of child psychology to the entire Europe and carry out a series of educational reforms. In the 1940s, he served as professor of experimental psychology and director of the psychological laboratory at the University of Geneva. He was elected chairman of the Swiss Psychological Society and founded the magazine Swiss Psychology. Published "Introduction to Genetic Cognition". In 1954, Piaget was elected president of the International Psychological Society and founded the "International Union of Scientific Psychology" as chairman. He passed away on September 16, 1980 in Geneva at the age of 84.