Position: Consultant Cardiologist & Electrophysiologist
Location: London UK

Mark O’Neill is a consultant cardiologist and electrophysiologist at St. Thomas’ Hospital London, and Professor of Cardiac Electrophysiology at King’s College London. He graduated from University College Dublin Medical School in 1998 with 1st class honours. His medical degree was intercalated with a physiology doctorate (DPhil), which he completed at Oxford University as a Rhodes Scholar (1992-1995). He then moved to London, where training in general medicine and cardiology was followed by subspecialty training in interventional cardiac electrophysiology at St Mary’s Hospital. From 2005-2006, Dr O'Neill completed a clinical research fellowship in Bordeaux with Professors Michel Haïssaguerre and Pierre Jaïs where he gained particular expertise in atrial fibrillation.

In October 2009, he joined St Thomas’ Hospital and King’s College London in the Department of Cardiology and Division of Imaging Sciences and Biomedical Engineering and was promoted to Reader in 2011 and Professor in 2013. He is the Departmental Lead for Arrhythmias in Adult Congenital Heart Disease and the Divisional research lead for electrophysiology. His primary research interests are the development and use of advanced signal processing and imaging technologies to improve arrhythmia characterization and treatment in patients with heart rhythm disturbances.