 Before being employed at Joe Gibbs Racing, Grubb worked for Stewart-Haas Racing as the crew chief for team co-owner Tony Stewart, winning the Sprint Cup championship in 2011.Before that he was at Hendrick Motorsports as an assistant and filled in as Jimmie Johnson's crew chief during the suspension of Chad Knaus at the 2006 Daytona 500.Johnson went on to win that race for his first Daytona 500 victory.