He was born in 1929 in Newark, New Jersey, and grew up in Rahway, New Jersey. Kagan is currently retired after being a professor at Harvard University in the Developmental program. He is one of the key pioneers of developmental psychology. He is Daniel and Amy Starch Research Professor of Psychology, Emeritus at Harvard University, and co-faculty at the New England Complex Systems Institute. He has shown that an infant's "temperament" is quite stable over time, in that certain behaviors in infancy are predictive of certain other behavior patterns in adolescence T. He did extensive work on temperament and gave insight on emotion. Kagan was listed as the 22nd most eminent psychologist of the 20th century, just above Carl Jung. Show Less