John Gray's book "Men Are from Mars, Women Are from Venus is the bestselling relationship book of all time. A Certified Family Therapist, Gray is also the author of eleven other bestselling self-help books including "Mars and Venus Starting Over and "Children Are from Heaven. Dr. Gray lives in Northern California. Bryan Turner, M.D. is a preventative healthcare cardiologist who has done and continues to do research on John Gray's nutritional supplementation program applying gender differences in brain science on diet and exercise.