Dr. Guy obtained his medical degree in 1986 from the University of Sydney. He subsequently trained at Concord, Lidcombe and St. Geroge Hospitals in Sydney, qualifying as a Cardiologist/Physician in 1995.

He moved to the Gold Coast in 1995. He has worked with the John Flynn Cardiology group and at John Flynn Hospital since 1995.

Since 2011, he has been teaching medical students from Bond University.