Frank Dochnal
Frank J. Dochnal was a race car driver from St. Louis, Missouri, United States. He had some success in local racing in Missouri before making a single attempt to qualify for a Formula One Grand Prix at the age of 42, with a Cooper T51 in the 1963 Mexican Grand Prix. Unfortunately, this bid failed after he crashed during unofficial practice. At this point he retired from race driving and continued to work as a race mechanic. He later worked for Howard Hughes and as a technical official for USAC.
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Source: Wikipedia