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Professor Mark O'Neill 


Professor Mark O'Neill

Professor O’Neill is a consultant cardiologist and electrophysiologist at St. Thomas’ Hospital London, and Reader in Clincial Cardiac Electrophysiology at King’s College London. The assessment and management of patients with heart rhythm disturbances is his field of practice.


Professor O’Neill 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, Professor O'Neill completed a fellowship in Bordeaux with Professors Michel Haïssaguerre and Pierre Jaïs where he gained particular expertise in atrial fibrillation: atrial arrhythmias have remained his main clinical and research interest. He was appointed Senior Lecturer at Imperial College and Honorary Consultant Cardiologist at St. Mary’s Hospital in 2008


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. He is clinical lead of the King’s Health Partners Clinical Academic Group, the Departmental Lead for Arrhythmias in Adult Congenital Heart Disease and the Divisional research lead for electrophysiology. He supervises three PhD students and has published over 250 peer-reviewed papers, books and proceedings in the field of arrhythmia medicine.


He is an internationally recognized expert in catheter ablation of atrial fibrillation and tachycardia. He is a Council member of the British Heart Rhythm Society and Chair of the BHRS Research Committee. He founded the London Deanery Subspecialty Electrophysiology Training Programme in 2008 and is the King’s Health Partners Training Programme Director for Electrophysiology. He is also an active member of the All Party Parliamentary Group on Atrial Fibrillation.



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