Born in Grasse, France, Théo first picked up his passion for motorsports in karting at two-and-a-half years old. He made his competitive debut at seven years old and ultimately scored a handful of French karting championships before graduating to single seaters at 14. 

Théo joined the FIA Formula 3 Championship in 2020 where he earned two wins and eight podiums en route to a second-place finish in the championship. At 16 years old, he became the youngest race winner in Formula 3 history with victories at Austria and Hungary.  

Making the jump to the FIA Formula 2 Championship in 2021, Théo produced a fifth-place finish in the standings with two wins and three podiums. Théo made history again as the youngest driver to ever win a Formula 2 race 2 at 17 years old. 

He then earned a trio of race wins with a second-place finish in the 2022 FIA Formula 2 Championship season before emerging as the series champion in 2023. Throughout his championship campaign, he secured two wins and 10 podiums as he led his French-based team, ART Grand Prix, to their first Formula 2 title. 

Théo subsequently served as a test and reserve driver for the Stake F1 Team Kick Sauber in 2024.

Making his NTT INDYCAR SERIES debut on the streets of Long Beach on April 21, 2024, Théo emerged as the ‘Biggest Mover’ in the race with an eleventh-place finish, and subsequently competed with Arrow McLaren at Barber Motorsports Park, the Indianapolis Motor Speedway Road Course, the Detroit street circuit and Road America.