Known for his collaborative practice (with Daniel Brooks, Soheil Parsa, Marcus Youssef, and others), Guillermo is a writer of drama, fiction, and film; a director, dramaturge, and actor. His work has been published, anthologized, seen, and heard on stages, pages, screens, and radios across the country and around the globe.

The author, or co-author, of, among other works, Fronteras Americanas, The Terrible but Incomplete Journals of John D., and bloom; The Adventures of Ali & Ali and the aXes of Evil and Ali & Ali: The Deportation Hearings (with Marcus Youssef and Camyar Chai); The Noam Chomsky Lectures and Insomnia (with Daniel Brooks); and A Line in the Sand (with Marcus Youssef). He is a recipient of the Governor General’s Award for Drama, a four-time winner of the Chalmers Canadian Play Award, a recipient of Dora and Jessie Awards, and sundry film festival awards including Prix de Publique, Montréal; Best Short, Cartagena (Colombia); Best Fiction Short, Tampere (Finland); Best Screenplay, Yorkton, and Best Film, Huesca (Spain) for his short film Crucero/Crossroads made with Ramiro Puerta. His critically-acclaimed collection of short fiction, Citizen Suárez, is published by Talonbooks.

His directing credits include: Lorca’s As Five Years Pass for the University College Drama Program; Sunil Kuruvilla’s Rice Boy at the Stratford Festival; Jovanni Sy’s Taste of Empire, in which actor/writer/cook Jovanni Sy considers links between colonialism and cuisine while preparing, cooking, and eventually, serving a traditional Filipino meal in a functioning kitchen; The Five Vengeances, Jovanni Sy’s kung fu adaptation of The Revenger’s Tragedy; The Caucasian Chalk Circle for Ryerson Theatre School; The Adventures of Ali and Ali and the aXes of Evil, which played to sold out audiences in Seattle after numerous productions in theatres across Canada; Miss Orient(ed) for Carlos Bulosan Theatre, for which he received a Dora nomination; Romeo and Juliet and Michael Miller’s play about Nelson Mandela, In the Freedom of Dreams, for Lorraine Kimsa Theatre for Young People; Rahul Varma’s Bhopal and M.J. Kang’s dreams of blonde and blue for Cahoots Theatre Projects, of which he was Artistic Director for five years; as well as the Jessie Award-winning production of Dennis Foon’s WAR for Green Thumb Theatre.

As an actor, he studied at Ryerson Theatre School, had a transformational experience at Théatre du Soleil, and worked happily for many years in what we once called Toronto’s alternative theatre. He has played Orlando in As You Like It, and Galy Gay in A Man’s A Man; he was the first actor to play Longomantanus in John Mighton’s Short History of Night, Elias in Joan Macleod’s Amigo’s Blue Guitar, and Dan in Daniel Brooks’s The Good Life. He will remount his one-person show Fronteras Americanas at Soulpepper this May. His current projects include a PhD at the University of Toronto’s Drama Centre.