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28. Cathie Lesjak
Interim CEO
Hewlett-Packard (HPQ)
2009 rank: 42
Age: 51

This longtime CFO stepped in for Mark Hurd when he resigned in August. Just weeks later her financial skills helped her orchestrate the purchase of data-storage provider 3PAR for $2.4 billion and IT security firm ArcSight for $1.5 billion. Investors are still wary -- HP's stock is down 14% since Hurd's departure.

NEXT: Pamela Nicholson
Last updated September 30 2010: 2:47 PM ET
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