mason made his open-wheel racing debut, competing in his father's formula vee in the scca in 2004. due to budget limitations he was only able to run several rounds, but scored a podium at pocono raceway. in 2005, mason got a late chance to race in the walter hayes trophy race in a spirit formula ford. his first foray in european racing and in formula ford, mason excelled around the silverstone circuit, in a car prepared just by him and his brother. in a field of over 150 cars, mason battled his way through the rainy conditions to make the final, and go from 18th to 3rd within the first 3 laps. after a race long battle for 3rd position, mason slid off the road into the gravel with 2 laps remaining. in 2006 mason headed back to north america, racing again in formula vee in the scca. he scored wins, podiums, and lap records on way to finishing 3rd in the championship at the 2006 scca runoffs. his european racing continued, competing in the formula ford festival in 2007 and 2008. his best result was 21st in 2007 after looking set for a top 10 finish, setting fastest lap, but was taken out of 4th place in the semi-final race, forcing him to race his way into the final through the last chance race. also he spent six races in 2010 italian formula three season with team ghinzani.