He and Bertha moved to Wisconsin so that he could attend the University of Wisconsin. Here, he became interested in psychology, and his school work began to improve dramatically. He spent time there working with Harry Harlow, who is famous for his experiments with baby rhesus monkeys and attachment behavior.
He received his BA in 1930, his MA in 1931, and his PhD in 1934, all in psychology, all from the University of Wisconsin. A year after graduation, he returned to New York to work with E. L. Thorndike at Columbia, where Maslow became interested in research on human sexuality.