The last American to compete in Formula One, Speed was a prodigy in Red Bull's talent search and development program. Having proved his mettle in Formula Renault and GP2, he landed the race seat with Scuderia Toro Rosso for two seasons. He then dropped out of F1 and migrated to stock cars and rallycross. Aside from an attempt to qualify for the Indianapolis 500 in 2011, this will mark the first time he'll be competing in an open-wheel single-seater since the 2007 European Grand Prix.
While most teams have stuck largely with the same drivers, the Andretti team has had a rotating door. It has put Franck Montagny, Jean-Eric Vergne, Charles Pic, Matthew Brabham and Marco Andretti behind the wheel so far this season, switching at least one of its drivers for each race.