Cardiac surgeon, Dr. Charles Hufnagel, owned this house in 1967. He developed and implanted (1952) the first artificial heart valve in a human patient. Dr. Hufnagel also assisted in the first human kidney transplant (1947). The Smithsonian Institution has displayed his heart valve in the past. Dr. Hufnagel was chairman of the Department of Surgery at Georgetown Medical School from 1969 to 1979 and passed away in 1989.