[1] After a long karting career as a child, Stefan stepped up to open-wheel racing in November 2006, competing in the Formula Palmer Audi Autumn Trophy at Snetterton and Brands Hatch.

Stefan gradually improved throughout his first six car races and finished the six-race mini-series in ninth place, also ending as top rookie.

He finished 2nd in the championship after a great final round at Croft, where he scored 2 podiums after his worst qualifying of the season, only starting 7th and 9th for the two races.

Part of the award was a prize drive in a McLaren Formula One car, which took place on the Silverstone National Circuit on 13 November 2009.

Despite Wilson's 2011 success, he was out of racing until the 2012 Indy Lights season finale at Auto Club Speedway where he drove for Fan Force United and finished sixth.

Wilson made his IndyCar debut at the 2013 Grand Prix of Baltimore driving for Dale Coyne Racing, finishing sixteenth.

In June 2014 Fan Force United announced that they had signed Wilson for the team's full-time step up to the IndyCar Series in 2015.