William G. Stevenson, M.D. is professor of medicine and director of the Cardiac Arrhythmia Clinical Research Program at Vanderbilt Heart and Vascular Institute. He is the founding editor of Circulation: Arrhythmia and Electrophysiology and serves as chair of the international advisory committee of the Cardiac Arrhythmia Network of Canada. He has published over 300 articles in the field of cardiac arrhythmias and his methods for mapping arrhythmias have been widely adopted.