His epitaph: "He gave to man control over that dreadful scourge, yellow fever."
He earned his medical degree in 1869 and spent most of his working career working on the cause and treatment of yellow fever while in the Army.
http://www.wramc.amedd.army.mil/welcome/history/Today a great hospital and medical center stand in constant tribute to Walter Reed. Due to the untiring efforts of Colonel William Cline Borden who was the initiator, planner and effective mover for the creation, location, and first Congressional support of the Medical Center, it is still referred to today as "Borden's Dream." Walter Reed Army General Hospital, as it was then known, opened its doors on May 1, 1909 to ten patients. Fourteen years later, General John J. Pershing signed the War Department order creating the Army Medical Center. In September 1951, the entire complex of 100 rose-brick Georgian buildings became known as the Walter Reed Army Medical Center in further tribute to this hero of medical science. In 1945 he was elected to the Hall of Fame at New York University, the first physician to be so honored. On November 21, 1966, a bronze bust of Major Reed was unveiled at Walter Reed Army Medical Center by the Walter Reed Memorial Association, an organization which, since its inception in 1903, had resolved to erect a memorial in Washington to perpetuate his fame and memory.