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 a member of the editorial boards of EP Lab Digest, Heart Rhythm, and UpToDate.