President and CEO BAE Systems, Inc. 2010 rank: 37 Age: 61
While the Britain-based defense company increased revenue in 2010, Hudsonís U.S. business saw its top line decline more than 5%. The industry trailblazer has been on an acquisition
spree to diversify in anticipation of a drop in the U.S. defense budget.
The list is compiled by FORTUNE editors, who consider four criteria: the size and importance of the womanís business in the global economy, the health and direction of the
business, the arc of the womanís career (resume and runway ahead), and societal and cultural influence.