John Sullivan Sullivan (born December 23, 1946) is the writer of several British sitcoms including the immensely popular Only Fools and Horses as well as Citizen Smith, Dear John, Just Good Friends, Roger Roger, and Green Green Grass. He also composed the theme tune of Only Fools and Horses, Just Good Friends and Dear John. He grew up in the South London area of Balham where he observed the sort of market trader that would later appear in Only Fools and Horses.
