A.J. Watson was a car builder and chief mechanic from 1949 through 1984 in the Indianapolis 500, winning the race seven times, which leaves him tied for the record for most wins by a builder.
The only American-born driver to win the Formula One World Drivers' Championship (Mario Andretti, an Italian American driver, won the World Drivers' Championship in 1978, but was not born in the United States). He also scored three wins at each of the 24 Hours of Le Mans and 12 Hours of Sebring sports car races.
An American club racer of midgets and sports cars who, aged 43, tried and failed to qualify a Cooper-Climax T51 for the 1963 Mexican Grand Prix. Subsequently he became an Indycar mechanic, worked for Howard Hughes and was a USAC official.