Bullins was hired in December 2011 by Penske Racing to crew chief the No. 22 team in the Nationwide Series beginning in 2012. He replaced Todd Gordon, who was promoted to crew chief Penske's No. 22 team in the Cup Series after Steve Addington left for Stewart-Haas Racing to be defending series champion Tony Stewart's crew chief that year. In his first year as crew chief for that team, he worked with Brad Keselowski, Parker Kligerman and Jacques Villeneuve. Kligerman would be released and replaced by Ryan Blaney for the rest of his part-time schedule in the car during the season. He earned three wins that season with Keselowski and came close to winning with the other two drivers as well, as Blaney finished second at Texas in November and Villeneuve finished third at Montreal after running out of fuel on the last lap and losing the lead he had held for most of the race. The team finished the year sixth in owner points. For 2013, the team saw a notable uptick in performance. Bullins won at least one race with all four drivers of the No. 22 car that year. Keselowski scored six wins, and Blaney would earn his first win in the series at Kentucky in September. Also, Joey Logano, Penske's new full-time Cup Series driver, also ran 14 races in the No. 22 car. Logano came to Penske from Joe Gibbs Racing at the start of the year, and he was instrumental in leading JGR's No. 18 car to the 2012 NNS owner's championship. A. J. Allmendinger replaced Villeneuve as the No. 22's driver for the standalone road course races of Road America and Mid-Ohio Sports Car Course, and would win both of them in dominating fashion. Logano would pick up three wins, which came at both Dover races plus Chicago in July. All of this success resulted in the team winning the 2013 owner's championship.
2020–present: Brad Keselowski
Despite even having a solid 2019 season, Penske announced a crew chief shakeup for the 2020 season in an effort to be more competitive and dominant like the successes Joe Gibbs Racing was having. During Bullins' time with the No. 12 of Ryan Blaney, the car was arguably the weakest in the Penske stable both years, and he was reassigned to Brad Keselowski's No. 2 team, replacing Paul Wolfe, who moved to Joey Logano's No. 22. Todd Gordon, who had been Logano's crew chief and was very much successful in that role, replaced Bullins as Blaney's crew chief on the No. 12. The duo started the year off on a good note, and Keselowski led 30 laps in the Daytona 500 and 82 at Phoenix three races later. After the first four races, the season was halted for two months due to the coronavirus pandemic.
