For 10 points, name this Swiss psychologist.
This man worked with Bärbel Inhelder to perform an experiment in which subjects were shown a 3D view of a mountain. This psychologist posited that people underwent accommodation or assimilation to adapt new information about the world into an existing schema. This psychologist identified the ability to realize an object was still there even after its (*) removal from sight; he found that that ability, object permanence, was not present in those less than two years old. Preoperational and sensorimotor are among the stages of this man's theory of cognitive development for children. For 10 points, name this Swiss psychologist.
This man worked with Bärbel Inhelder to perform an experiment in which subjects were shown a 3D view of a mountain.
Jean Piaget