Tizard, Sir Henry Thomas (1885-1959), a British scientist, fostered the development of radar early in World War II (1939-1945). He also persuaded the United Kingdom's Royal Air Force to learn the new tactics of air fighting that the introduction of radar made necessary. In 1933, Tizard was made chairman of the Committee for the Scientific Survey of Air Defence. In 1940, he led a scientific mission to Washington, D.C., to share with the United States details of the United Kingdom's war inventions.