Dr. John Gannage graduated from University of Toronto medical school in 1990 and completed his residency in Family Medicine at the University of Ottawa. At the University of Toronto he was recognized with the Medical Society Award for Outstanding Contribution to the Faculty of Medicine, where he earned Honours in 3 years and was President of the Men's Athletic Association while serving on Student Council. In 2000 he was voted Markham's Best General Practitioner, and later served as Medical Director of  Meadowbrook Sport Medicine and Rehabilitation Clinic in Markham. He has obtained two diplomas in Homeopathy, and studied extensively in the fields of Clinical Nutrition and Functional Medicine.  He maintains an active medical licence in good standing from the College of Physicians and Surgeons of Ontario. 

Dr. Gannage founded and is currently the Medical Director of Markham Integrative Medicine, where he has been emphasizing prevention and treatment of chronic disease through nutrition, detoxification and reduction of oxidative stress, while addressing the underlying cause of disease using biomedical modalities, since 1998.  In addition, Dr. Gannage has been administering Chelation Therapy since 1999, in which he is specifically trained, and has also received training in Oxidative Medicine and Lipid Exchange Therapy.  He is a Defeat Autism Now clinician, and has membership in the Ontario Society of Physicians for Complementary Medicine (OSPCM), the American College for Advancement in Medicine (ACAM), the Canadian Society of Orthomolecular Medicine (CSOM), the Ontario Medical Association (OMA) and the Canadian Association of Physicians for the Environment (CAPE), for which he is an Eco-Leader.  Dr. Gannage is a principal investigator for TACT (the Trial to Assess Chelation Therapy). He regularly educates the community and other practitioners through public presentations, has appeared on radio, and written numerous articles for publication.