Our Doctors

Frederick Ma, MD, is a chronic pain physician licensed by the College of Physicians and Surgeons of Ontario (CPSO) and he leads the diagnostic wing of Bloor Pain Specialists. Patients referred to BPS will usually be seen by Dr. Ma first for an assessment, appropriate investigations, initial treatment, and he will coordinate their care with the other members of the team for additional assessments or interventional procedures.

Dr. Ma finished his residency at Case Western Reserve University, Cleveland, Ohio with a focus on sports medicine. He has provided care for patients at post-surgical, orthopedic, stroke, and geriatric wards at Providence Health Care in Toronto.

Dr. Ma takes special interest in combat sports, sports injuries, and regenerative injection therapies, and provides ring-side medical care to competitive boxers as part of Boxing Ontario.

Dr. Ognjen (Ogi) Visnjevac, MD, FRCPC, D.ABA (ANES), D.ABA (PM), is a triple-boarded pain management specialist with a focus on spine pain currently accepting new patients at Bloor Pain Specialists.

Dr. V is an FRCPC anesthesiologist who completed his interventional pain management sub-specialty training at the Cleveland Clinic, the largest academic pain management department in the US, and practices as a staff physician at Cleveland Clinic Canada.

Dr. V also serves as adjunct faculty at McMaster University. He is an avid medical researcher and leads the BPS Research Division.

Dr. Hien Ta is an anesthesiologist and a pain consultant at Bloor Pain Specialists. He holds current certification in the Royal College of Physicians of Canada as well as the College of Family Physicians of Canada.

He is a consultant in Pain Medicine from 2009 to present. Additionally, he has a professional membership in the Canadian Medical Association, the Ontario Medical Association and is a member of the chronic pain section of the OMA.

He is also a member of the Medico-Legal Society of Toronto. He is also C-CAT (PM) certified by the Canadian Academy of Psychologists in Disability Assessment (CAPDA) and the CSME.

He is an assessor for the College of Physicians and Surgeons of Ontario in Anesthesiology and in Chronic Pain.