David Armstrong is Professor of Medicine at McMaster University and inaugural holder of the Douglas Family Chair in Nutrition Research After 2 years as a family practitioner in Labrador, he completed his clinical and research GI training in the UK, Switzerland and Canada. His clinical and research interests include gastroesophageal reflux disease, dyspepsia, functional bowel disorders, inflammatory bowel disease, celiac disease, nutrition, short bowel syndrome, colon cancer screening and quality in endoscopy with over 300 publications. He was President of the Canadian Association of Gastroenterology (CAG) from 2016-2018, Regional ACG Governor for Ontario from 2009-2018 and Chair of the Canadian National Colon Cancer Screening Network (NCCSN) from 2013-2023. He is Treasurer of the International Working Group for the Classification of Oesophagitis (IWGCO) and Co-Chair of the IWGCO Consensus Guidelines on the Management of Refractory GERD.