John Mullen was born in Dundalk, Ireland, and moved to England as a young man to pursue a career which culminated in him reaching retirement as managing director of a car dealership. As a pastime, he became an enthusiastic actor as a member of the New Forest Players. A passion for athletics saw him help form the Andover Athletic Club, where he became a successful middle-distance coach. A holiday in Spain encouraged him to move there on retirement, where he presently lives near Marbella.