Gauthier was best known for his supporting and recurring roles in popular TV shows, such as “Eureka”, where he played Vincent, the owner of the local diner, “Once Upon a Time”, where he played Smee, the sidekick of Captain Hook, and “Supernatural”, where he played Ronald Reznick, a bank employee who believed in aliens. He also had guest appearances in other shows, such as “Smallville”, “Psych”, “Fringe”, “The Flash”, and “The Good Doctor”.