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31. Joanne Maguire
EVP, Space Systems
Lockheed Martin (LMT)
2009 rank: 35
Age: 56

Maguire, who has been on our list since 2006, has increased her segment's operating profit every year since she took the reins in 2006. Fun fact: She's helping develop the planned successor to the Space Shuttle for NASA.

NEXT: Marillyn Hewson
Last updated September 30 2010: 2:47 PM ET
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