Dr Walker is a consultant gastroenterologist at the Royal United Hospital, Bath and practices privately at the BMI Bath Clinic. He qualified with distinction from Imperial College London (Charing Cross and Westminster Medical School) and undertook his gastroenterology training in North West Thames, London. This provided him with broad training in all aspects of gastroenterology and he developed a particular interest in inflammatory bowel disease (Crohn's disease and ulcerative colitis).
He spent 3 years as a clinical research fellow studying the role of genetics and gut bacteria in the aetiology of inflammatory bowel disease, and was awarded a Doctorate of Medicine in 2011.
Dr Walker has a keen interest in teaching and completed a Postgraduate Certificate in Medical Education at the Royal College of Physicians. He is a Honorary Senior Clinical Lecturer at the University of Bristol and teaches medical students at the Royal United Hospital, Bath.