Mooney wrote some of Pryor's routines for his appearance on Saturday Night Live, co-wrote his material for the Live on the Sunset Strip, Bicentennial Nigger, and Is It Something I Said albums, and Pryor's film Jo Jo Dancer, Your Life Is Calling.
Mooney also wrote for Redd Foxx's Sanford and Son, Good Times, acted in several cult classics including Which Way Is Up?, Bustin' Loose, Hollywood Shuffle, and portrayed singer/songwriter Sam Cooke in The Buddy Holly Story.