Zimmerman raced in the USAC Champ Car series from 1968 to 1972 with 16 career starts, including the 1971 and 1972 Indianapolis 500.
Zimmerman's racing career spanned from 1968 to 1972, encompassing 16 starts in the USAC Champ Car series, with notable appearances at the 1971 and 1972 Indianapolis 500 races.