Retired from Test cricket, Simpson toured England in 1968 as a member of the press gallery and later worked in public relations. He looked after promotion and marketing earnings for cricketers in an era where they struggled to survive financially. During the 1975–76 season, he had organised for both Australian and West Indian players to market shampoo and deodorant, and he helped to find sponsors for the Australian team. He also called for the revival of the Cavaliers XI concept to boost the popularity of cricket. He wrote a book titled "Captain's Story", in which he expressed his anger against bowlers that he believed to have bowled with an illegal action. His former teammate Meckiff took issue with the contents and sued for libel. After five years of litigation, Simpson settled out of court and apologised to Meckiff.