 He initially worked as a teacher, teaching mathematics at a school in London and later science through the medium of Welsh in Bethesda, Wales.Parry joined BBC Wales in 1966 and helped to establish the scripts department, where he worked on Welsh programmes such as "Pobol y Cwm".He also has writing credits for the TV play "Grand Slam" and the feature film "Un Nos 'Ola Leuad" (based on the book by Caradog Prichard).