Dr. Ian Grayson obtained his BSc and DDS from the University of Toronto. Following graduation in 1981, Dr. Grayson completed a General Practice Residency at Toronto General Hospital. He was in private practice for over 25 years and was Clinical Director at LIUNA Local 183 Dental Centre in Toronto until 2013. That year, he entered Harvard School of Dental Medicine and completed his Masters of Medical Science in Endodontics and Microsurgery. Following graduation, he was named Clinical Director of Endodontics at HSDM. Subsequently, he joined Limited to Endodontics in Brookline, MA and in 2021, was appointed Endodontic Instructor and Lecturer at Cambridge Health Alliance in Cambridge, MA. Since 2017, he has been retained by The Expert Witness Institute based in New York, NY to provide opinions and testimonies for pending litigations.

Upon returning to Toronto in 2023, Dr. Grayson splits his time as endodontist in private practice, Clinical Instructor of Post-graduate Endodontics at the University of Toronto, and Associate Clinical Professor of Endodontics at the University of Buffalo, NY. For fun and relaxation, he spends as much time as possible on squash courts and ski hills.

Dr. Grayson is a Fellow of the Royal College of Dentists of Canada and a Diplomate of the American Board of Endodontics.