He is the son of former sports car racing driver Charles Zwolsman Sr., who competed in the late 1980s and early 1990s.

The unknown driver made an impression quickly; he was fastest in qualifying in the first race at Long Beach.

Zwolsman went on to win three races that season and clinch the championship over rivals Tõnis Kasemets and Katherine Legge.

The newly crowned Atlantic champion made his Champ Car debut in the season finale in Mexico City for Team Australia.

In 2009 Zwolsman is driving for the Kolles LMP1 team in the Le Mans Series where he is currently placed 9th in the LMP1 driver standings.