Mayor of Indianapolis. Robert Henry Tyndall was born in Indianapolis, the son of William Eddy and Alice (Boyd) Tyndall. In 1908 he married Hazel Dean Spellman, a daughter of Samuel and Emma Spellman of Indianapolis. The Tyndall's had three children. In 1897 Tyndall enlisted in Battery A of the Indiana National Guard, and the following year served with the 27th Battery, Indiana Volunteers in Puerto Rico, during the Spanish American War. Following the war Tyndall became a partner in a merchandise brokerage company in Terre Haute, Indiana, and moving to Indianapolis in 1903 to be a partner in a tailoring firm. In 1916 he sold out to his partner and re-entered military service. In August 1917 Tyndall was named colonel of what became the 150th Field Artillery of the 42nd (Rainbow) Division. This division participated in several major battles, including Saint Mihiel and the Meuse-Argonne. Tyndall received numerous decorations and awards, including the Distinguished Service Medal and the French Croix de Guerre and Legion d'Honneur. He served in the army of occupation in Germany (1918-19), and was honorably discharged from active service in May 1919. In 1921 he was commissioned Colonel, Field Artillery Officer's Reserve Corps and by 1924 was promoted to Major General. Returning to civilian life, Tyndall was vice-president of the Fletcher American Bank (1919-25). He was national treasurer of the American Legion for the first eight years of its existence (1919-25). From 1925 to 1932 he worked with Carl G. Fisher in the Fischer's enterprises at Miami Beach and Montauk Beach, Florida. For the next ten years he was associated with a consulting engineering firm. In 1941 Tyndall mobilized the 50,000 troops of the 38th Division at Camp Shelby, Mississippi before forced into retire due to reaching the statutory age of sixty-four. He then entered into local politics and was elected Mayor of Indianapolis in 1942, serving until his sudden death from a heart attack. Tyndall Armory in Indianapolis, the headquarters for the Indiana Army National Guard's 76th Infantry Brigade, was named in his honor.