Gastroenterology

St Mark’s has a National and International reputation in disorders of the gastrointestinal tract, especially inflammatory bowel disease, nutrition and intestinal failure, endoscopy and complex surgery. Simon Gabe Co-Chairs the supra-regionally funded Intestinal Failure service, one of two centers in the UK funded to provide this service. He was appointed as Senior Lecturer at St Mark’s and Imperial College in 2000. Since 2005 this has become an NHS appointment. His MD thesis was on intestinal …

She specialises in small bowel disease, particularly coeliac disease, and the management of diabetes with supplemental nutrition. Dr Donnelly graduated from University of Glasgow in 2000 and completed her specialist registrar training in South London, Kent Surrey and Sussex region. Dr Donnelly has always had an interest in small bowel diseases and in particular nutritional consequences of these diseases. She undertook an additional year of training in advanced nutrition with the national …

I am a consultant Paediatrician & Paediatric Gastroenterologist based in North West London. As a full time children’s doctor at both St Mark’s Hospital in Harrow, Middlesex, and Chelsea and Westminster Hospital, London I specialise in general paediatrics, and paediatric gastroenterology, food allergy with nutrition. I am committed to provide the highest standards of paediatric care - taking pride in a consultant delivered service. Presently, I see in excess of 1500 new out …

Margaret Vance is Nurse Consultant in Gastroenterology at the Wolfson unit for endoscopy at St Mark’s hospital**.** She leads a team of specialist research nurses and nurse endoscopists providing gastroscopy, flexible sigmoidoscopy, colonoscopy and capsule endoscopy at St Mark’s Hospital. Margaret has a wide experience of training both nurses and doctors in flexible sigmoidoscopy and colonoscopy and developed the first completely nurse-led theoretical and practical flexible sigmoidoscopy …

Professor Ailsa Hart is Director of St Mark’s Hospital Inflammatory Bowel Disease Research and Consultant Gastroenterologist. In 2016, she achieved academic promotion with Imperial College and is now Professor of Practice. Professor Ailsa Hart studied medicine at Oxford University and was awarded a First Class Honours Degree in 1992, together with the George Pickering Prize for Medicine and Surgery proxime accessit in 1995 and additional prizes for outstanding achievements. She achieved …

Brian Saunders’ main clinical interests are the diagnosis, treatment and prevention of intestinal diseases through flexible endoscopy. He has performed >20,000 colonoscopies and has a particular interest in therapeutic colonoscopy especially advanced polypectomy; endoscopic mucosal resection (EMR) and endoscopic submucosal dissection (ESD). Much of his work also involves colonoscopic screening and surveillance of those patients at increased risk of developing colorectal cancer. Professor …

Dr Siwan Thomas-Gibson is a gastrointestinal endoscopist and luminal gastroenterologist. She has been a consultant at the hospital since 2006 and is the deputy director of the Bowel Cancer Screening unit. She was Clinical lead for the department from 2011-2016. Siwan was appointed to the prestigious post of Chair of JAG from January 2017 to January 2020, overseeing the quality of endoscopy services and training throughout the UK. Her specialist interests include the prevention, diagnosis and …