Peter B. Cotton is Professor of Medicine, and Director of the Digestive Disease Center, at the Medical University of South Carolina in Charleston. He was born and educated in England, where his father was a rural family physician. He graduated in 1963 from Cambridge University and St. Thomas Hospital Medical School. During a year of bench research as part of his GI training, he came across a paper describing the first fiberoptic gastroscope with a biopsy capability.

Christopher Williams is Consultant Physician in Gastrointestinal Endoscopy at St. Mark's and Northwick Park Hospitals in London, England. He is Director of the Wolfson Unit for Endoscopy and its associated Kennedy Leigh Academic Centre. This focuses on development of new approaches to colonoscopy, its teaching, and aspects of colorectal cancer prevention. He has private practice at the London Clinic and is Honorary Consultant at several other hospitals. Christopher Williams was born in 1938 in Norwich, England.