Psicobiologo, American administrator and educator. He was born in Philadelphia and studied at Tufts University (Harvard). It occupied a place of Professor at Princeton, where he developed a large research activity.
He became interested in animal behavior, the neuroembriologia, the neuroanatomy and neurophysiology. It was the first academic psychologist who studied the prenatal origins of behavior, coming to the conclusion that the use, practice or experience during the development, do not guarantee a neurobehavioral development. He proposed the study of behavioural problems from the standpoint of the psychobiology and the evolutionary approach.His most important work is the manual of child psychology (1945).