Niv Ad, MD, is Chief of Cardiac Surgery and Director of Cardiac Surgery Research at Inova Heart and Vascular Institute (IHVI) on the campus of Inova Fairfax Hospital in Falls Church, Virginia. Dr. Ad is a leading authority on the surgical treatment of atrial fibrillation via minimally invasive as well as conventional surgical techniques. He also leads a research unit at IHVI that conducts long-term follow-up studies of patients who have had various types of cardiac surgery. Recently Dr. Ad has been active in studies involving new aortic valves implanted via either catheter-based or surgical procedures. He has published more than 100 research articles in peer-reviewed publications.