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Harry Hartz was an American race car driver born on December 24, 1896, in Pomona, California. He began his racing career in the early 1920s. Hartz finished second in the Indianapolis 500 three times (1922, 1923, and 1926) and won the AAA National Championship in 1926. A severe crash in 1927 left him with serious injuries that required two years of hospitalization.
After retiring from racing, Hartz transitioned to a successful career as a car owner and chief mechanic. He fielded the Miller-Hartz Specials, which won the Indianapolis 500 in 1930 and 1932, driven by Billy Arnold and Fred Frame, respectively. Hartz set numerous speed records and participated in promotional events for Chrysler. He continued to contribute to the racing community as a vice-chairman of the American Automobile Association technical committee and later with the United States Auto Club. Hartz passed away on September 26, 1974.
For more information, you can read "Harry Hartz: The Man and His Cars" by Mark Dill and "The Complete Encyclopedia of Motorcars 1885-1968" by G.N. Georgano.