He has a wide range of interests, including soccer, snowboarding, skateboarding, cycling and playing the guitar and numerous other instruments.
Jamie went to Kenya with the organization "Free the Children" to build a school and filmed as a special for MTV.
He played guitar in a band called SoundSpeed along with a few of his fellow Degrassi cast mates.
Other films include, "Jesus Henry Christ", "The Tenth Circle", "Killer Instinct", "My Babysitter's a Vampire", and numerous Movie of Week productions.
In 2016, Johnston reprised his role as Peter Stone on Degrassi: Next Class for 4 episodes during its second season.