He spent his childhood in Kapuskasing near Ontario, but then his family moved to Montreal. It was only here that he began to study English, because he only spoke French until now. Dupuis did not plan to become an actor and began to study physics. However, when he saw the film "Moliere," he caught the acting bug. Roy's entrance to school was very unusual. His colleague had assured interrogations in the \ "L \ 'Ecole National du theatrc du Canada \" but he got bored of waiting so Roy entered his place. In 1986, Roy graduated from high school and began a successful career in the theater. From 1988, he started working in the film and filmed at least one year. In 1991, Roy played Yves in 'Being at Home with Claude', a film that won international recognition and was the official representative of Canada at the Cannes Festival in 1992. The following year Roy played Alex \ 'O' Neil \ 'in Cap Tourmente \', for which in 1993 he was nominated for the Genie Award for best male role. Participation in such films opened the way to American cinematography. Roy also got a chance to show his language talents - he also knows Spanish, thanks to his performance in the film "Passage des Hommes Libres", which was produced in a Venezuelan-Canadian-French co-production.