Professor Siwan Thomas-Gibson is a gastrointestinal endoscopist and luminal gastroenterologist. She is the Divisional Medical Director at St Mark’s.
She has been a consultant at the hospital since 2006 and is a Professor Practice (Endoscopy) at Imperial College London. She was Clinical lead for the endoscopy department from 2011-2016. Siwan was National Chair of JAG from January 2017 to January 2020, overseeing the quality of endoscopy services and training throughout the UK. She has previously been the Dean of the St Mark’s Academic Institute and deputy director of bowel cancer screening. She sits on the Council of the British Society of Gastroenterology.
Her specialist interests include the prevention, diagnosis and endoscopic management of pre-cancerous colonic lesions, both as a screening procedure but also in patients with inflammatory bowel disease and those at increased risk of developing colorectal cancer. She specialises in advanced endoscopic imaging and complex therapeutic endoscopy including polypectomy, endoscopic mucosal resection, colonic stricture dilation. She is developing innovative minimally invasive techniques in collaboration with her surgical colleagues.
A significant part of her role in the department is devoted to postgraduate education and training of endoscopists. Her work in the area of training in colonoscopy aims to improve the quality, safety and standards of care to all patients undergoing endoscopic examination. Her more recent research interests also include developing more sustainable endoscopy services -‘Green Endoscopy’.
Professor Thomas-Gibson represents the hospital at numerous national and international meetings. She has been awarded the John of Arderne medal by the Royal Society of Medicine’s coloproctology section and the British Society of Gastroenterology Hopkins prize for her research work. In 2006 she gained an MD for her work in ‘Improving Training and Assessment in Colonoscopy’. This work has generated a large number of scientific papers and book chapters. She is regularly invited to speak on issues concerning the improvement of colonoscopy standards; teaches national and international trainees attending endoscopy hands-on, therapeutic and lecture courses.