Chester took on the position of head of Renault's Vehicle Performance Group (VPG) in 2005,[3] contributing towards Renault's double championship wins of 2005 and 2006 (F1 Constructors' Championship and Drivers' Championship for Fernando Alonso).[7] Chester oversaw the development of the tuned mass damper system, which was a major innovation. In 2010 Chester was made head of performance systems.[3]
In 2012, Chester was appointed engineering director of Lotus, playing a major part in the race winning E20 and E21 F1 cars. A year later, he replaced James Allison as the team's Technical Director, therefore being responsible for the design and development of every Formula One car to come out of Enstone from May 2013 until January 2020.[8]