USAC and CART Championship Car series driver from 1967 to 1983; he won 5 races in 166 career starts, but finished just 1 Indy 500 in 15 starts.
He was a successful youth racer before debuting professionally as a 20-year old.
Most of his contemporaries believed that he was an elite driver with a below-average vehicle.
He grew up in Oklahoma City, Oklahoma, and died in an off-roading accident; his son, Michael, was in the car with him, but was not hurt.
The only Indy 500 he finished was in 1979, when he placed third behind A.J. Foyt and winner Rick Mears.