29. Pamela Nicholson
President and COO
Enterprise Holdings
2009 rank: 34Enterprise Holdings
Age: 50
Revenue in 2009 dropped about 8%, to $12.1 billion, as consumers cut back, but the S&P raised the family-owned rental-car company's ratings. Nicholson is only Enterprise's second president outside the Taylor family and is a contender for the top job.
NEXT: Mary Callahan Erdoes
Last updated September 30 2010: 2:47 PM ET
