Dr Monahan undertook his PhD at Cancer Research UK and at St Mark’s Hospital, and has spent 9 years working at West Middlesex University Hospital and Chelsea & Westminster Hospital where he still leads a cancer genetics clinic. He is also an honorary senior clinical lecturer at Imperial College London.
Dr Monahan performs genetic testing, endoscopic and other screening for gastrointestinal cancer in susceptible populations, such as those people with a family history of cancer, and also has an interest in prevention and early detection of cancer. He has research interests in clinical and molecular aspects of gastrointestinal pathology, particularly in the field of endoscopy, colorectal, pancreatic and other gastrointestinal cancers