Mark is a Toronto-based playwright and co-artistic director of the Pea Green Theatre Group with his wife and partner Sue Miner. Mark's stage plays include: The Martha Stewart Projects, Playballs, The Blue Wall, Medici Slot Machine, and High Sticking. In 2001, Mark was nominated for a Governor General's Literary Award for his play Monsieur d'Eon. He also received a Dora Mavor Moore Award with Chan Ka Nin for the opera Iron Road. In 2006, Mark received a Dora Mavor Moore nomination for his play Medici Slot Machine. Other works include The Weaving Maiden (Soundstreams/Tafelmusik Choir), Ice Time (Tapestry Music/Opera to Go), The Chevalier St. George (Tafelmusik Baroque Ensemble), and The Storyteller's Bag (Mississauga Chamber Ensemble/Lorraine Kimsa Theatre for Young People).