Guy works as a neuropsychologist with military personnel, veterans and RCMP officers at the Operational Stress Injury (OSI) Clinic in Quebec City. He is also an EMDRIA-approved supervisor and a facilitator for the Niagara Stress and Trauma Clinic training school. Furthermore, he is a clinical professor at Laval University. Guy was previously a program manager in a neurotrauma centre responsible for road and work accidents. He was also in charge of 12 beds in an internal facility for people with physical polytrauma. Lastly, Guy previously served as a board director in a homeless shelter.