|Other Retailer||Price Checked Time||Their Price in AUD||Our Price|
|Amazon UK||1 days ago||41.24||$25.64||You save $15.60|
|Amazon US||yesterday||27.98||$25.64||You save $2.34|
Burrhus Frederic Skinner (1904 1990), regarded by many as the most important and influential psychologist since Freud, earned his doctorate in psychology at Harvard University in 1931. Following appointments at the University of Minnesota and Indiana University, he returned to Harvard in 1948. He remained there for the rest of his career, retiring in 1974 as Edgar Pierce Professor of Psychology.