(1913 – January 12, 1998[1][2]) was a well-known educational psychologist who studied the cognitive development of students during their college years. He was a professor of education at the Harvard Graduate School of Education and founder and longtime director of the Bureau of Study Counsel. While at Harvard, he developed his theory of the intellectual and cognitive development of college-age students through a 15-year study during the 1950s and 1960s.