What makes a crew chief one of NASCAR's best?
Is it his ability to keep a driver cool, calm and collected over the course of a 500-mile race?
Is it his knack for finding a loophole in the rules that provides his car an advantage, or for developing a strategy that conserves more fuel than the rest of the pack?
Is it the way he leads his team, motivating everyone to perform at the highest level every weekend until they win a Sprint Cup?
Of course it's not a single factor—it's a combination of all of these that will take a crew chief to the top. Some get lucky by landing with a mercurial driving talent, but many are an indispensable part of the team's success, race managers without whom their driver would be considerably lower in the standings.
These 10 crew chiefs fall into the latter category.