Rehan is a Consultant Gastroenterologist at University College Hospital, He trained at St Mary’s Hospital in London and completed his Gastroenterology training in North East London. He was then appointed to a two-year academic fellowship at UCLH where he examined state of the art diagnostic and therapeutic endoscopic techniques in the gastrointestinal tract, including endoscopic treatment of early cancers.
He is the director of endoscopy for the division of gastroenterology at University College London and delivery of minimally invasive endoscopic therapy for early cancer. He continues to be involved actively in several national and international clinical trials in his field. His research activities focus on advanced endoscopic imaging for detection of early cancer and minimally invasive endoscopic therapy for early oesophageal cancer. He is a member of the oesophageal committee of the British Society of Gastroenterology.