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.
Broadway theatre | Alberta | West End theatre | musical theatre | Royal National Theatre | theatre | Royal Court Theatre | American Ballet Theatre | University of Alberta | Musical theatre | National Theatre | Theatre Royal, Drury Lane | Bolshoi Theatre | Abbey Theatre | Progressive Conservative Association of Alberta | Legislative Assembly of Alberta | Haymarket Theatre | Banff, Alberta | Theatre Royal | Play (theatre) | Alberta Liberal Party | Globe Theatre | Theatre | Mariinsky Theatre | Manhattan Theatre Club | Lyric Theatre | Théâtre du Châtelet | Her Majesty's Theatre | Grand Théâtre de Genève | Théâtre des Champs-Élysées |
He has worked as a director or playwright for numerous companies including Vancouver Playhouse, Arts Club Theatre, Touchstone Theatre, Alberta Theatre Projects, working on plays by people such as Veda Hille, Bill Richardson, Sean Dixon, Morris Panych, Melissa James Gibson.
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.
He has collaborated with other artists across Canada including Karen Hines, Daniel MacIvor and da da Kamera, One Yellow Rabbit, Rumble Productions, Theatre Replacement, Instant Coffee, Alberta Theatre Projects, Theatre Passe Muraille, Go Chicken Go, Factory Theatre, the Theatre Centre and Downstage Theatre.