NASCAR crew chief best known for his time with Hendrick Motorsports, Dale Earnhardt Incorporated and Melling Racing. He is the first crew chief to win five straight championships, doing so each year from 2006 to 2010.
He was born in Rockford and was serving as his father's crew chief by age fourteen.
He has been suspended by NASCAR several times for offenses including a seat belt violation and an illegal adjustment to a car's window.
His father John was a race car driver who won the Great Northern Series.
He has won multiple NASCAR titles as the crew chief of Jimmie Johnson.
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