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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, 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, monochorionic (identical) twin complications and fetal therapy, including in utero laser treatment to resolve twin-twin transfusion syndrome (TTTS), fetal chest and bladder shunting, fetoscopic tracheal occlusion for severe congenital diaphragmatic hernia (CDH), fetal spina bifida surgery and cardiac interventions, all firsts in Canada.

Dr. Ryan has consulted nationally and internationally. He has published more than 150 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 diaphragmatic hernia lung, cardiac lesions and spina bifida 


Major Research Activities

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



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