Mitchell is responsible for creating or influencing the design of over 72.5 million automobiles produced by GM, including such landmark vehicles as the 1938 Cadillac Sixty Special, the 1949 Cadillac Coupe deVille, the 1955-57 Chevrolet Bel Air, the 1959-1984 Cadillac DeVille, the 1963-65 and 1966-67 Buick Riviera, the 1961-76 Corvette Stingray, the 1970-81 Chevrolet Camaro, the 1976-79 Cadillac Seville, and the 1980-85 Cadillac Seville.