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Dr. Greg Ryan
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Dr. Greg Ryan

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Mount Sinai Hospital
600 University Avenue
Toronto, Ontario
M5G 1X5

Tel: 416-586-4800
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Dr. Greg Ryan 

Dr. Greg Ryan is a perinatologist at Mount Sinai Hospital, Toronto. He is head of the University of Toronto Fetal Medicine program, which is based at Mount Sinai.

He is a Professor in the Department of Obstetrics & Gynaecology, Division of Maternal-Fetal Medicine, University of Toronto & is cross-appointed to the Department of Medical Imaging.

He trained in Dublin, Winnipeg, Hamilton, Toronto, Glasgow & London, UK. He came on staff in Toronto in 1992.

His main interests are in the areas of high-risk pregnancies, obstetric ultrasound, fetal anomalies, twin complications and fetal therapy including in utero laser treatment to resolve twin-twin transfusion syndrome, fetoscopic tracheal occlusion for severe congenital diaphragmatic hernia and fetal spina bifida surgery, a first in Canada.

Dr. Ryan has consulted nationally and internationally. He has published more than 140 articles in peer-reviewed journals




At a Glance

  • Perinatologist and head of the University of Toronto Fetal Medicine Program, based at Mount Sinai Hospital
  • Pioneer in fetal surgery and fetal therapy for twin-twin transfusion, congenital hernia and spina bifida 


Major Research Activities

Dr. Ryan studies high-risk pregnancies, fetal anomalies, twin complications and fetal therapies.



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Ontario Health Study Faculty of Medicine, University of Toronto. mitacs honorary partner


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