+44 (0)20 7407 3100

Treatments & Specialties

Consultant Gastroenterologist

Dr Jason Dunn

Dr Jason Dunn

Consultant Gastroenterologist


Dr Jason Dunn is a Consultant Gastroenterologist at Guy's and St Thomas' Foundation Trust Hospitals. He studied at GKT medical school, graduating in 2000. He was awarded MRCP (London) in 2005 and appointed as a consultant in 2012.

He has a special interest in Barrett’s oesophagus, early Upper GI cancer and oesophageal endoscopic therapy. He is proficient in Endoscopic Mucosal Resection (EMR) and Radiofrequency Ablation (RFA) techniques. He is the Early Diagnosis Lead for the London Cancer Alliance (LCA) and has written guidelines for the management of Barrett’s oesophagus for the LCA.

Dr Dunn also has an interest in Nutrition, and he is the Nutrition Lead for the Guy’s Hospital site, specialising in parenteral nutrition in oncology/palliative care and PEG tube insertion

He was awarded a CRUK clinical fellowship at UCL and studied use of optical diagnostics and minimally invasive therapies for the treatment of Barrett’s oesophagus. He gained his PhD in 2011 and has presented his work at national and international meetings. His work on treatment of Barrett’s oesophagus with RFA, and the use of biomarkers to predict cancer progression, has won prizes. He has published in high impact factor journals and book chapters. He currently holds Honorary Senior Lecturer posts at Kings College London and Oslo University in the Institute of Medical Informatics.

Dr Dunn is a member of the British Society of Gastroenterology, the American Gastroenterological Association and the British Association for Parenteral and Enteral Nutrition.

Special interests

Barrett’s oesophagus, HALO radiofrequency ablation, endoscopic mucosal resection (EMR), Crohn’s disease, ulcerative colitis, gastro-oesophageal reflux disease, dyspepsia, irritable bowel syndrome, inlet patch and globus, squamous dysplasia, colonoscopy, parenteral nutrition, PEG tube insertion. 

Consulting Address

St Thomas Street, The Shard



Consulting Sessions:

Tuesday EVE, Friday AM at The Shard


Nicole Merrall


020 7403 3814


020 7403 0858







NHS Base:

Guy's & St Thomas' NHS Foundation Trust