Upon his return to Canada in 1974, he took on the title role in the premiere of the English translation of Michel Tremblay's Hosanna at the Tarragon Theatre.
It has championed the work of Canadian playwrights David French, Michel Tremblay, Judith Thompson, Jason Sherman, Michael Healey and others, as well as productions of plays by canonical playwrights such as Anton Chekhov and August Strindberg.
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A graduate of the George Brown Theatre School, Gall is a playwright in residence at Toronto's Tarragon Theatre, and artistic director of his own theatre company, The Room.
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 appeared on stage in The Dishwashers by Morris Panych (Tarragon Theatre, 2005) and The Oxford Roof Climbers Rebellion by Stephen Massicotte (Tarragon Theatre/Great Canadian Stage Company, 2006).
In September 2009 he starred in the Dora Award Nominated Mimi: The Poisoners Comedy at the Tarragon Theatre and then returned to the Citadel Theatre in 2011 playing Quasimodo in Catalyst Theatre's production of Hunchback, a role that he would reprise in Vancouver in 2012.