Born in Scarborough, Ontario, Canada, Gallanders began appearing on several television series before receiving his first role in the feature film Murder at 1600.
In 1998 he appeared in three feature films, Reluctant Angel, the drama Babyface and the horror sequel Bride of Chucky, with Jennifer Tilly.
The following year, Gallanders received a small role in the Agnieszka Holland drama The Third Miracle, with Ed Harris and Anne Heche and Prisoner of Love, featuring Naomi Campbell.
In 2007, Gallanders portrayed the role of 'Major Brent Beardsly' in Shake Hands with the Devil, an award-winning historical war drama based on the Rwandan genocide.
Many of Gallanders television credits include Millennium, La Femme Nikita, Mutant X, the American/Canadian version of Queer as Folk and Kevin Hill which only lasted one season.