She received her medical degree from the Royal College of Surgeons in Ireland in 1996. In addition, Dr. Lennon has obtained a Ph.D degree from The National University of Ireland. She did her internal medicine residency in the Mater Hospital, Dublin and the Cleveland Clinic. She did her Gastroenterology Fellowship in Edinburgh, Scotland and Advanced Endoscopy Fellowship at Johns Hopkins. She became a member of the Royal College of Physicians of Ireland in 1998. She is accredited in General Internal Medicine and Gastroenterology certified by the Joint Royal Colleges of Physicians Training Board (JRCPTB) of the United Kingdom. Her research interests include interventional endoscopy, pancreatic cysts and proteomics.