Mark S. Link is Professor of Medicine and Director of Cardiac Electrophysiology at UT Southwestern Medical Center in Dallas. As a practicing cardiac electrophysiologist, Dr. Link has clinical interests in ablation procedures and sudden cardiac death. His active research projects focus on sudden cardiac death in athletes, commotio cordis, long-term follow-up of patients with ICDs, and the influence of air pollution on sudden cardiac death and arrhythmias. Dr. Link is currently an Associate Editor at Circulation and a member of the editorial boards of EP Lab Digest, Heart Rhythm, and UpToDate. He serves on the American Heart Association (AHA) Emergency Cardiovascular Care Committee, and he is immediate past chair of the AHA Science subcommittee of the AHA Emergency Cardiovascular Care Committee.