Konstantinos Ath. Gatzoulis was born in Drama, Greece, and received his medical degree from the Aristotle University of Thessaloniki in 1980. After serving in the Air Force Army and as a rural doctor and after receiving the Visa Qualifying Examinations he was accepted to practice in the clinical specialty of Internal Medicine at the Cleveland Metropolitan General Hospital of Case Western Reserve University for  three years receiving the Boards of Internal Medicine (USA). He was then trained in Clinical Cardiology and in Cardiac Electrophysiology (1987-1991) at University Hospitals of the same University receiving the Boards of Clinical Cardiology and the title of Cardiac Electrophysiologist (1989,1991, USA). He returned to Athens, Greece as a research associate joining the 1st University Department of Cardiology and the State Cardiology Division of Hippokrateio General Hospital of Athens for 8 years (1991-1999).

From 1995 and for a period of two years he also served as Assistant Professor of Cardiology at the University of Thessalia (Larissa, 1995-1997). He then joined the Medical School of the National Kapodistrian University of Athens (NKUA) as a Lecturer (1999) for 5 years, as an Assistant (2004) for seven years, as an Associate Professor (2011) for another 9 years, to become a full Professor of Cardiology in 2020. During this period of activities at the Medical School of NKUA a large number of young cardiologists were trained in Clinical Electrophysiology being exposed to the whole spectrum of non invasive and invasive Cardiac Electrophysiology (EP) procedures while 343 publications in related educational and research fields became avalaible. The later covering the broad spectrum of interventional Cardiac Electrophysiology with emphasis on diagnosis and therapeutic techniques for the prevention of the sudden cardiac death among heart failure patients at early relatively asymptomatic stage with well maintained Left Ventricular Function.