George Daniel "Doc" MacKenzie (July 16, 1906 – August 23, 1936)[1][2] was an American racing driver.
After being involved in and surviving a five-car crash during the 1936 Indianapolis 500, he was killed in a sprint car crash at the Milwaukee Mile in West Allis, Wisconsin the same year.
[3][4] 1935 Hankinson Circuit and AAA Eastern Champ.
[5] First ever to hold both titles.