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16th Ambulatory Endoscopy Clinic Day 

Thank you for attending the 16th annual Ambulatory Endoscopy Clinic Day. Please find below more details about the program.

OACE Executives and Board Members

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Dr. Doug Hemphill
Program Chair, OACE Board of Directors

Dr. Doug Hemphill practices gastroenterology and hepatology at the Royal Victoria Regional Health Centre and at Barrie Endoscopy in Barrie, ON.  He performs endoscopy in both hospital and clinic settings.  He is also the Regional Colorectal Screening/GI Endoscopy Lead for the Simcoe Muskoka Regional Cancer Program. Dr. Hemphill was the founding member of the Ontario Association of Clinic Endoscopists (OACE) and is an active member of the executive. 

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Dr. Andrew Bellini
President and MIG Co-Chair

Dr. Bellini received his medical degree from the University of Toronto in 1992.  He went on to complete his training in Internal Medicine and subsequently Gastroenterology at the University of Toronto and has been practicing Gastroenterology at William Osler Health Centre (formerly Peel Memorial Hospital) since 1997. 

In addition to his clinical duties, he has had roles with Cancer Care Ontario/Ontario Health serving as the regional lead for GI endoscopy for the Mississauga Halton/ Central West region since 2016, Medical Director of The Scope Clinic since 2008, Medical Director of Endoscopy for William Osler Health System since 2023, and has participated on provincial expert panels for Anaesthesia use in Endoscopy, Family History of Colorectal Cancer Guidelines, and the QBP working group for endoscopy.  He is also serving a second term as the current President of the Ontario Association of Clinic Endoscopists and Co-Chair of the Ontario Medical Association Medical Interest Group – Clinic Endoscopists.

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Dr. Ian Bookman
Past President and MIG Co-Chair

Dr. Ian Bookman is Head of the Division of Gastroenterology at St. Joseph’s Health Centre and Medical Director of the Kensington Screening Clinic in Toronto. He is ex-president of the Ontario Association of Clinic Endoscopists. Dr. Bookman is co-founder of, a virtual, multi-disciplinary IBS clinic with Registered Dietitians, Naturopathic Doctors, Psychologists, and Nurse Practitioners. He is also the founder of, a charity that raises awareness of colon cancer screening and prevention.


Dr. Francois Flamand
OACE Board of Directors

Dr. Francois Flamand obtained his Bachelor degree in Science (BSc) and his Doctorate degree in Medicine (MD) from the University of Manitoba. Following a surgical internship, Dr Flamand completed a 5 year residency in surgery in London, Ontario. He is a Fellow of the Royal College of Surgeons of Canada and a Fellow of the American College of Surgeons. He completed additional studies in minimally invasive surgery of the colon in Hamilton and Toronto. His primary interests are in endoscopy and laparoscopic surgery of the colon and rectum. He is affiliated with Cambridge Memorial Hospital. He was chief of surgery from 1998 to 2000 and has a busy practice in Cambridge.


Dr. Nelson King
OACE Board of Directors

Dr. King was born and raised in Toronto.  He is a graduate of Earl Haig Secondary School in North York. He attended Queen’s University in Kingston, Ontario for his undergraduate work, and later completed medical school at the University of Toronto, graduating in 1991.  Dr. King completed his surgical training at the University of Toronto and joined the Royal College as a Fellow in 1996. He recently celebrated his 25th year as a member of Department of Surgery at the Etobicoke campus of the William Osler Health System.


His focus is on the surgical management of both benign and malignant conditions. During his tenure Dr. King has served as the Head of the Division of General Surgery.  Dr. King was a founding partner in the Ontario Colonoscopy Clinic, which continues to provide   care in colon cancer screening in the community. To date, the clinic has performed more than 30,000 procedures. Dr. King was an original executive member of the Ontario Association of Clinic Endoscopists (O.A.C.E.) in 2008.

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Dr. Nicky Marwaha

Dr. Avantika Marwaha provides GI-related services at the GI Health Centre in Burlington and to the surrounding communities. Dr. Marwaha is passionate about working in underserviced areas and with underprivileged communities. She has provided internal medicine and gastroenterology care to many underserviced areas within Canada, including Thunder Bay, Ontario, Yellowknife, Northwest Territories, and Cambridge Bay, Nunavut. She also did an educational elective at the All India Institute of Medical Sciences (AIIMS), a government hospital in New Delhi, India, during her gastroenterology training. These experiences have instilled in her the importance of providing holistic and culturally sensitive care to patients.

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Dr. Augustin Nguyen
Vice President

Dr. Nguyen continued with his training in internal medicine and gastroenterology at the University  of Toronto. He is a Fellow of the Royal College of Physicians and Surgeons of Canada in both internal medicine and gastroenterology. His interests in gastroenterology include inflammatory bowel disease, chronic liver disease, endoscopy, and quality of care. He has active staff privileges at Cambridge Memorial Hospital and is the current Chief of the Department of Medicine, Physician Director of Medical Programs, Physician Lead in Endoscopy, as well as Co-Chair of the Endoscopy Quality Committee and Clinical Operations Excellence Committee. He has also been on a number of regional committees including currently the Waterloo Wellington Endoscopy Quality Improvement and Performance Committee. He is a founding member of the Tri-City Colonoscopy Clinic in Kitchener. He has been Medical Director of Tri-City Colonoscopy since 2013. He is also a founding and operating partner in Cambridge Infusion Services.


Dr. Liliana Oliviera
Member of the executive

Dr. Liliana Oliveira is a clinical gastroenterologist at the Montfort Hospital in Ottawa and a co-owner of the Ottawa Gastrointestinal Institute. Her main interest is inflammatory bowel disease.

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Dr. Mark Silverberg

Dr. Mark Silverberg is Professor at the Department of Medicine, University of Toronto, and a  gastroenterologist in the Division of Gastroenterology Mount Sinai Hospital Inflammatory Bowel Disease Centre, Toronto. He is clinician-scientist at the Lunenfeld-Tanenbaum Research Institute and is the Gale and Graham Wright Research Chair in Digestive Diseases at the Zane Cohen Centre, Mount Sinai Hospital, Toronto. Dr. Silverberg is the founder of the Toronto Immune and Digestive Health Institute (TIDHI), an outpatient IBD centre.  He has contributed to the discovery of genes related to Crohn’s disease, ulcerative colitis, and pediatric IBD and is a major contributor to the field of phenomics and classification of IBD (The Montreal Classification). He holds leadership positions on the following international collaborative organizations: the International IBD Genetics Consortium and the NIDDK/NIH IBD Genetics Consortium, the Advanced IBD Fellowship Program at MSH and the Canadian GI Fellows Program in IBD, the International Organization for the study of Inflammatory Bowel Disease (IOIBD), the Scientific and Medical Advisory Council of Crohn’s and Colitis Canada, and the IMIBD Section of the American Gastroenterological Association Council.


Dr. Vincent Thien
OACE Board of Directors

Dr. Vincent Thien is the GI Division Lead for Scarborough Health Network in Scarborough, ON, and practiced for 16 years at Scarborough Birchmount Hospital (SHN). His special interests are in general gastroenterology and hepatology, and in medical education at the University of Toronto.

2024 Planning Committee

Ian Bookman, MD, FRCPC

Doug Hemphill, MD, FRCPC

Liliana Oliveira, MD, FRCPC

Mark Silverberg, MD, PhD, FRCPC



Rupert Abdalian, MD

Dr. Rupert Abdalian is current divisional chief of Gastroenterology at North York General Hospital, North York, ON. He has a special interest in inflammatory bowel diseases, clinical nutrition, and obesity medicine. He is also actively engaged in endoscopy education at the hospital, training both GI and general surgery fellows.

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Natalia C. Calo, MD

Dr. Natalia C. Calo is an Assistant Professor of Medicine at the University of Toronto and a therapeutic endoscopist at St. Michael's Hospital in Toronto, where her clinical focus is the care of patients with pancreaticobiliary disease. Previously, she worked as an Assistant Professor of Medicine at the University of Ottawa and therapeutic endoscopist at The Ottawa Hospital.  Dr. Calo's research interests encompass patient-centered outcomes in therapeutic endoscopy and quality improvement in gastrointestinal endoscopy. In particular, she aims to expand her research to understand complications of pancreatitis and the impact of endoscopy in high-risk patients. Dr. Calo's overreaching objective is to combine her clinical expertise in advanced therapeutic endoscopy with research and educational activities. 

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Quoc Huynh, MD, FACS

Dr Quoc Huynh is the Head of General Surgery at Humber River Hospital with a special in Bariatric and Robotic surgery.

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Jeffrey Mosko, MD, MSc, FRCPC

Dr. Jeffrey Mosko is an assistant professor of medicine and a clinician in quality and innovation at St. Michael’s Hospital, University of Toronto. He is the co-director of the advanced endoscopy fellowship and the education site director. His clinical expertise is in both luminal and pancreaticobiliary advanced endoscopy. His research interests are in quality improvement in endoscopy.

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Dominik Nowak, MD

Dr. Dominik Nowak is currently a faculty member at the Dalla Lana School of Public Health and the Department of Family and Community Medicine at the University of Toronto, as well as a family doctor at Women's College Hospital in Toronto. Dr. Nowak is the President of the Ontario Medical Association and a recipient of the College of Family Physicians of Canada Award of Excellence for his leadership in Canadian health care.

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Colleen Parker, MD

Dr. Colleen Parker is currently a staff gastroenterologist at the University Health Network and an assistant professor of medicine at the University of Toronto. Her clinical and research area of interest is disorders of gut brain interaction with a particular focus on the role of chronic stress and resilience in these conditions.

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Robert Riddell, MD, FRCPC

Dr. Robert Riddell is Head of the Sections of Gastrointestinal Pathology Mount Sinai Hospital in Toronto and Professor of Laboratory Medicine and Pathobiology at the University of Toronto and GI Pathologist for Mt Sinai and Women’s College Hospitals. He is interested in all forms of inflammatory and neoplastic disease throughout the GI tract. Dr. Riddell has authored over 300 publications, which are largely in gastrointestinal pathology and also a few textbooks including a two-volume "bible" on gastrointestinal pathology and its clinical implications which is about to go into a 3rd edition. He has been part of GI pathology fellowship training programs for 30+ years and is Director of the GI Pathology Fellow at Sinai.


This event would not come to fruition without the help of our industry sponsors. 



Celltrion Healthcare






Eli Lilly








Vantage Endoscopy


Boston Scientific

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