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Jon Barrett, M.B.Bch., FRCOG, MD, FRCSC

Senior scientist

Sunnybrook Health Sciences Centre
2075 Bayview Ave., Room M4 172a
Toronto, ON
M4N 3M5

Phone: 416-480-4920
Fax: 416-480-4933

Administrative Assistant: Kelly Costa or Cindy Yancu
Phone: 416-480-4920
Email: or

Clinical ProfileShow/hide details

Dr. Barrett is the head of the maternal-fetal medicine program at Sunnybrook. In addition to providing general prenatal and obstetrical care, he also specializes in the care of women with high-risk twin/multiple pregnancies.

Research ProfileShow/hide details


  • M.B.Bch., 1983, bachelor of medicine and bachelor of surgery, University of the Witwatersrand, South Africa
  • FRCOG, 1988, Royal College of Obstetricians and Gynaecologists, U.K.
  • MD, 1992, University of Newcastle-upon-Tyne, U.K.
  • FRCSC, 1995, Fellow of the Royal College of Physicians and Surgeons of Canada

Appointments and Affiliations:

  • Associate scientist, Evaluative Clinical SciencesWomen & Babies Research Program (director), Sunnybrook Research Institute (SRI)
  • Associate professor, department of obstetrics and gynaecology, University of Toronto
  • Chief, maternal-fetal medicine, Sunnybrook Health Sciences Centre
  • Investigator, Centre for Mother, Infant and Child Research, SRI
  • Director, multiple pregnancy, obstetrics and gynecology, Sunnybrook 
  • Head, maternal-fetal medicine, Sunnybrook 
  • Representative, maternal morbidity and mortality, World Health Organization
  • Council member, International Society for Twin Studies
  • Council member, Society of Obstetricians and Gynaecologists of Canada (SOGC), Ontario representative
  • Chair, Canadian Working Group on Maternal Mortality and Morbidity in Canada
  • Committee chair, multiples committee, SOGC
  • Committee member, medico-legal committee, and planning committee, SOGC
  • Canadian representative, International Society for Twin Studies
  • Reviewer, American Journal of Obstetrics & Gynecology, Journal of the SOGC, Twins Research and Canadian Medical Association Journal
  • Member, Women's College Hospital Foundation
  • Member, advisory board, Multiple Births Canada

Research Foci:

  • Multiple pregnancy
  • Maternal morbidity and mortality

Research Summary:

Dr. Barrett coordinated and published the first Canadian consensus on the management of multiple pregnancies, pioneered Canada's first specialized multiples clinic and was awarded an innovation grant by Sunnybrook Health Sciences Centre worth $200,000.

He is the principal investigator of the Twin Birth Study run by the Centre for Mother, Infant and Child Research at Sunnybrook Research Institute. The Twin Birth Study is a multicentre, randomized clinical trial funded through an $8.7-million grant from the Canadian Institutes of Health Research. More than 140 centres in 30 countries are part of this study, which has shown that planned vaginal birth is as safe as planned cesarean section for twin deliverya finding that is changing clinical practice.

In 2009, Dr. Barrett coordinated the first Canadian consensus conference on near-miss maternal mortality.

Selected Publications:

See current publications list at PubMed.

Download Dr. Barrett's full CV (PDF)

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