Dr. John Sapp’s research efforts have centred primarily on ventricular tachycardia investigation and management. His research work includes studies of intramyocardial needle ablation for treatment-refractory ventricular tachycardia, the role of catheter ablation for ischemic ventricular tachycardia, body surface mapping to derive an inverse solution and quantify its accuracy and the improvement of rapid mapping of ventricular tachycardia.