Mullery enjoyed a successful playing career with clubs such as Fulham and Tottenham Hotspur.
In 1976 Mullery retired from playing and took up a manager's position at Brighton.He went on to manage at Charlton Athletic, Crystal Palace and QPR, before returning to Brighton in 1986. He left the club in January 1987. There followed a spell in Malaysia and a Directorship of Football at Barnet.
Mullarey is now a TV pundit.