Answer
Back to School is a 1986 comedy film starring Rodney Dangerfield as Thornton Melon, a wealthy businessman who decides to go back to college to earn his degree. Ned Beatty plays the role of Dean Martin, the dean of the college who is initially skeptical of Melon's motives but eventually comes to respect him. The film also stars Sally Kellerman, Keith Gordon, and Robert Downey Jr.