Ellis Roemer French, a successful and influential Montauk businessman who began the resort there known as the Panoramic View, died at New York Presbyterian/Weill Cornell Medical Center on Aug. 10, following complications of open-heart surgery to replace a more than 40-year-old prosthetic mitral valve, one of the oldest original valves still functioning. He was 80 years old and had been hospitalized for 23 days.