After graduation from the German School of Athens, Dr. Theofilos M. Kolettis obtained his MD degree from Medical School, University of Athens in 1984 and his PhD in 1991. He trained in Cardiology at the Edinburgh Royal Infirmary, UK and at the Athens General Hospital. He worked as a clinical research associate at the Department of Electrophysiology, Eastern Heart Institute, NJ, and as an attending physician at the Onassis Cardiac Surgery Center, Athens, Greece. He is currently Professor in Cardiology at the University of Ioannina, Greece. Dr. Kolettis practices in the field of cardiac pacing and clinical electrophysiology. His research focuses on the pathophysiological effects of endothelin during myocardial infarction, with respect to ventricular remodeling and tachyarrhythmias. He has a special interest in medical ethics and has served as Chairman of the National Ethics Committee since 2017.