Michael Mario Andretti is an American semi-retired auto racing driver and current team owner. Statistically one of the most successful drivers in the history of American open-wheel car racing, Andretti won the 1991 CART PPG Indy Car World Series and amassed 42 race victories, the most in the CART era and fourth-most all time. Since his retirement from active racing, Andretti has owned Andretti Autosport, which has won four IndyCar Series championships and five Indianapolis 500 races.