From 1974-1987, John Mawson was in the British Merchant Navy (Qualified Ships Captain). From 1988-2006, he was in the City of London, marine insurance, claims and law. He was vice president for a major international shipping company and occasional delegate to the United Nations. In 2006, he took an intensive post graduate course in drama with The Actors Company, at the London Centre for Theatre Studies and became a professional actor and writer. In 2011, he moved to Los Angeles.