4 of 8
4. O. Bruton Smith
O. Bruton Smith
Age: 82
Job title: CEO, Sonic Automotive and Speedway Motorsports

The man known for bringing NASCAR to Wall Street hasn't slowed down. Speedway Motorsports, the company he founded in 1959, runs eight tracks, including ones in Atlanta and Bristol. His other public company, $500 million Sonic Automotive, runs 160 car dealerships.

NEXT: Alfred Mann

Last updated October 24 2009: 8:22 AM ET
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