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Margaret (Peggy) Marcon

Title: MD
Designations: Staff Gastroenterologist, Division of Gastroenterology, Hepatology and Nutrition
Alternate Contact Name: Sandra Layno
Alternate Phone: 416-813-7735
Alternate Email:


Dr. Peggy Marcon is a paediatric gastroenterologist. She graduated from McNeese State University in Louisiana, attended medical school at Louisiana State University, Shreveport, undertook her paediatric residency at the University of Texas Southwestern, and then completed a fellowship in Paediatric Gastroenterology at SickKids.

Once on staff she set up the Gastrointestinal Motility Testing Suite.  With her interest in gastrointestinal motility she oversees the Motility Clinic as well as co runs the Aerodigestive Clinic (with Respirology and Surgery) and the Eosinophilic Esophagitis Clinic with Dr. Jessie Hulst.

Her other clinical and research interest is Celiac Disease and she runs the Celiac Clinic with Dr. Catharine Walsh. She collaborates with Endocrinology to study children with Celiac Disease and Type 1 Diabetes.


Marcon’s research interests follow her areas of clinical interest and expertise. In general the clinical studies have evolved from groups of patients seen in the Motility Clinic, especially those with swallowing disorders. This includes esophageal motility problems, such as Achalasia and Eosinophilic Esophagitis As a member of Aerodigestive Clinics they are looking at long term outcomes, burden of care and morbidity.

Dr. Marcon also has an interest in Celiac Disease and have collaboration with Paediatric Endocrinology. They have a large multi-center study looking at dual diagnosis – Celiac Disease and Type 1 Diabetes, and the effect of gluten free diet.

Education and experience

  • 2011–Present: Associate Professor, University of Toronto, Toronto, ON
  • 1989–Present: Paediatric Gastroenterologist, The Hospital for Sick Children, Toronto, ON
  • 2005–Present: Project Investigator, Research Institute, The Hospital for Sick Children, Toronto, ON
  • 1986–1989: Subspecialty Fellow, Paediatric Gastroenterology, The Hospital for Sick Children, University of Toronto, Toronto, ON
  • 1983–1986: Resident, Paediatrics, Children’s Medical Centre, University of Texas Southwestern Health Science Centre, Dallas, TX
  • 1983–1986: MD, Louisiana State University, Shreveport, LA
  • 1979: B.Sc., McNeese State University, Lake Charles, LA, Magna Cum Laude


SickKids-led study shows success with a blenderized diet for children with G-Tubes

A SickKids-led collaborative study with Children’s Hospital of Eastern Ontario (CHEO) has shown the benefits of switching gastrostomy tube (G-tube)-fed children from commercial formula to homemade puréed food.

Division of Gastroenterology, Hepatology and Nutrition

Our objective is to brighten the future for children with GHN disorders.

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