Co-Director: The St Mark’s Centre for Familial Intestinal Cancer, Sub-Dean, Consultant Gastroenterologist at the Family Cancer Clinic and St Mark’s Endoscopy and Clinical Scientific Officer at St Mark’s Hospital. NHSE Lynch syndrome Programme Clinical Advisor.

Elected member of Insight Council (The International Society for Gastrointestinal Hereditary Tumours (InSiGHT)) in 2024.

Appointed in 2025 to the Scientific Advisory Board for the Propective Lynch Syndrome Database (PLSD), an international collaborative effort to compile existing information on carriers with pathogenic mismatch repair gene variants (path_MMR variants) associated with dominantly inherited cancer.

NHSE Lynch syndrome Programme Clinical Advisor. I have been instrumental in the development of the national bowel cancer screening programme for Lynch syndrome in England which launched in July 2023, and was co-lead for an NHS England National Lynch Syndrome Transformation Programme, designed to ensure diagnosis of this condition in people with a diagnosis of cancer.

PhD in Cancer Genetics from Imperial College and the University of London 2009.

Professor Monahan is currently continuing research interests in clinical and molecular aspects of gastrointestinal pathology, particularly in the field of endoscopy, colorectal, pancreatic and other GI cancers, GI polyps and other neoplasia. He is the CI for the FIT for Lynch multicentre study, focused on development and evaluation of biomarkers in the surveillance of people with Lynch syndrome, and CI for the Lynch Cancers (LynC) study, an investigation in to molecular and immune events in this population.