George Daniel "Doc" MacKenzie (July 16, 1906 â August 23, 1936) 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.
1935 Hankinson Circuit and AAA Eastern Champ. First ever to hold both titles.