Sir John Arthur `` Jack '' Brabham , AO , OBE ( born 2 April 1926 ) is an Australian former racing driver who was Formula One champion in 1959 , 1960 and 1966 .
Sir John Arthur `` Jack '' Brabham , AO , OBE ( born 2 April 1926 ) is an Australian former racing driver who was Formula One champion in , and .