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Derek was a freelance cinematographer and a lecturer in film, video and digital media production at Queen's from 1976 to 2015, teaching the Fundamentals of Production regularly and in some years Advanced Production or Video and Multimedia. He created the Film and Media Department's website in 1995 and maintained it until 2015, and served on the University's Instructional Technology Advisory Committee, Web Editorial Board, Radio Policy Board, and Campus Planning Committee.