In 2005, Theobald graduated to Formula Three, racing in the German Formula Three Championship for the same SMS Seyffarth Junior Team as his brother Johannes. He finished the season just outside the championship"s top ten in eleventh place, with the highlight being a fastest lap at the penultimate round at the Lausitzring.
Formula König
After a long karting career, Theobald stepped up to single-seaters in 2002, racing in the Formula König series in his native Germany. Formula Renault 2.0
2004 saw Theobald move up to the Formula Renault 2000 Germany series. In his eleven races in the championship, he scored 23 points to be classified in 28th position.
Formula Three
After starting the year with a Renault–powered Dallara F302, he switched to a Dallara F303–Mercedes after the fifth round at the Nürburgring.
Foreign 2006, Theobald continued in Formula Three, this time moving to the Formula Three Euroseries. He was entered into the new Trophy Class for cars used between 2002 and 2004.
Despite only taking part in half of the seasons" twenty races due to budget constraints, Theobald secured the Trophy Class title after the seventh round of the year at Zandvoort, taking six class wins from ten races in the process. Formula Renault 3.5 Series
After testing for Pons Racing at the end of 2006, Theobald made his Formula Renault 3.5 Series debut at Donington Park in September 2007, replacing Jaap van Lagen at Eurointernational.
Competing in the final eight races of the season, he failed to score any points, taking a best race result of 18th at both Donington and the season finale in Barcelona.
Theobald made a return to the series in 2008, signing for British team Fortec Motorsport a few days before the opening round of the season at Monza. He completed the first four races of the season for the team at Monza and Spa-Francorchamps before being replaced by Fairuz Fauzy from the Monaco round onwards. Formula Two
Career summary
Complete Formula Renault 3.5 Series results
(key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)
Complete Formula Two results
(key) (Races in bold indicate pole position.
Races in italics indicate fastest lap).
