Dr Sarah Clark is a Consultant Physician and Gastroenterologist at St George's Hospital and Medical School, having been appointed in 2003. Dr Clark undertook her medical training in Nottingham, completing her specialist training in gastroenterology in London.

Her practice encompasses all aspects of general gastroenterology and Hepatology, Dr Clark having a particular clinical interest in Hepatology, including the investigations of abnormal liver function tests, the management of chronic liver disease, hepatobiliary disease (both benign and malignant) and viral hepatitis. Dr Clark also participates in the general internal medicine rota at St George's Hospital.

Her Doctorate of Medicine was carried out at Kings Liver Unit, investigating insulin resistance in acute liver failure, this predominantly being undertaken on the Liver Intensive Care Unit.

Dr Clark is skilled in both diagnostic and therapeutic endoscopy and colonoscopy, and has a particular interest in Endoscopic Retrograde Cholangiopancreatography (ERCP).