Shaun defines his own work by his goals, and models his development as an actor after one of his favourite films, The Man Who Shot Liberty Valance. Shaun says, In demonstrating the codes of commitment and honour, this film inspires one to be, simply, a good man.

Shaun was born and raised in Ponoka, Alberta, about an hour south of Edmonton, where he earned his Bachelor of Fine Arts Degree in the acclaimed Drama Program from the University of Alberta.

Johnston's first work as a professional was in Edmontons thriving theatre scene. It was there that he co-founded Shadow Theatre, which currently remains as one of Edmontons most successful theatre companies. In 1993, he played his first lead in a feature film as a loose-living biker in William Horneckers tragic drama, Two Brothers a Girl and a Gun. Shaun tells a story of how he cheerfully negotiated his way to shooting the Indie Film for a rack of Budweiser, a tshirt and a Buck Knife. Best investment I ever made, he states. That role won him the first of several Alberta Film & Television Awards for best actor and a long career. Numerous film and television roles followed in both Canada and the U.S. including X-Files, Jake and the Kid, Smallville, Traders, DaVincis Inquest, the Gemini Award winning Mayerthorpe and Emmy Award winning Bury My Heart at Wounded Knee.

In 2007 Shaun took on the role of Jack Bartlett and received a Gemini nomination for his work on HEARTLAND's first season.

An actor who incarnates a North American western archetype, Johnston would have been at home in Gary Cooper, John Wayne and Glenn Ford pictures of other eras. Reassuringly old school, his Jack Bartlett stands for home, honesty, and uncomplaining acceptance of whatever cards life hands him.

Off-screen, Johnston is an avid hockey player and guitar player. In his own words Shaun states, Yeah, thats true. But maybe we ought to replace the word avid with the word average. Ha! Hes an ardent Charitable Event Producer having raised funds and awareness for organizations such Big Brothers Big Sisters, Childrens Cottage Society and Autism Calgary. In 2011, Shaun was honoured to receive the David Billington Award, presented annually to an Albertan who has made an invaluable contribution to Albertas production community with their passion and dedication.