Born in Chertsey, England, Kimball grew up in Camarillo, California. His father, Gordon, was involved in motorsports; sources indicate he had connections to Formula One teams, though the specific nature of his design work is not detailed in available information.
Kimball began his single-seater career in 2002, participating in the American Formula Dodge national championship, where he finished tenth overall. He also won three races in the SCCA Formula Ford series that year. In 2003, he moved to Formula Ford US, finishing third overall with two race wins and seven podium finishes. He also contested the UK Formula Ford winter series, taking one race win to finish third overall.
In 2004, Kimball competed in the full UK Formula Ford championship for Team JLR, taking two race wins and eleven podiums on his way to fourth in the championship. He finished eighth in the end-of-season Formula Ford Festival at Brands Hatch. His performances earned him a drive with front runners Carlin Motorsport in the 2005 British Formula 3 Championship, where he took five race wins to finish an impressive second behind teammate Álvaro Parente.
Kimball competed in the IndyCar Series from 2011 to 2021. He finished nineteenth in points with a best finish of ninth at the New Hampshire Motor Speedway in 2011. In 2012, he finished nineteenth in points despite missing a race due to injury. He finished second at the Honda Indy Toronto, his first career podium finish. Kimball won his first IndyCar race on August 4, 2013, at the Honda Indy 200 at Mid-Ohio.
In 2007, Kimball departed the Formula Renault 3.5 Series due to the onset of Type 1 diabetes which required hospitalization. As part of his ongoing treatment, he wears a wireless blood sugar monitor and carries sugar water on board the car while racing.
In 2013, Kimball won the 24 Hours of Daytona, co-driving with Juan Pablo Montoya, Scott Pruett, and Memo Rojas. In 2014, he scored four top-five finishes and placed ninth in points. In 2015, he finished third at the Indianapolis 500 and the Grand Prix of Sonoma, and finished fifth at the Grand Prix of Indianapolis. He finished fifth at both Indianapolis races and got eleven top-fives in sixteen races, which earned him a ninth overall position in 2016.
Kimball was born in England but grew up in Camarillo, California. He married Kathleen, whom he first met in high school, in 2014. The couple relocated to Indianapolis, where they live with two dogs. Kathleen earned her MBA from Indiana University Kelley School of Business and works at Kimball Marketing Group. Kimball is a long-time fan of the Los Angeles Dodgers baseball team.
His IndyCar career concluded after the 2021 season, during which he failed to qualify for the Indianapolis 500 for the first time in his career.
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