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Semple's stage work included performances with the Alberta Theatre Projects, Canadian Stage Company, Manitoba Theatre Centre, Shaw Festival, Stratford Shakespeare Festival, Tarragon Theatre and Vancouver Playhouse Theatre Company.
As an actress, Northan has worked in theatres across Canada including Theatre Calgary, Manitoba Theatre Centre, Fringe Theatre Adventures (Edmonton), Quest Theatre (touring theatre for young people) and Alberta Theatre Projects where she appeared in the Fall Ensemble and playRites, a festival of new Canadian Work.
At the Manitoba Theatre Centre, he was Tony Award-winner Len Cariou’s Associate Artistic Director, and was named Director of the Year by the Canadian Broadcasting Corporation.
The Drawer Boy premiered in Toronto at Theatre Passe Muraille in 1999, and was subsequently produced by Ed Mirvish Productions at the more opulent Winter Garden Theatre in Toronto and the Manitoba Theatre Centre, Winnipeg in 2001.