31 of 50
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
25 Highest-paid women Which corporate women raked it in - and how much did they earn? More
The D.C. power list Meet the women calling the shots in Washington. More
Global power brokers These female executives are on top of the world. More