August Samuel Duesenberg (December 12, 1879 – January 18, 1955) was a German- born American automobile and engine manufacturer who built American racing and racing engines that set speed records at Daytona Beach, Florida, in 1920; won the French Grand Prix in 1921; and won Indianapolis 500-mile races (1922, 1924, 1925, and 1927), as well as setting one-hour and 24-hour speed records on the Bonneville Salt Flats in Utah in 1935. He also shared with his older brother, Frederick S. "Fred" Duesenberg, patents filed in 1913 and renewed in 1918 for a four-cylinder engine design and the Duesenberg Straight 8 (an eight-cylinder engine with a single, overhead camshaft).