As head of the U.S. subsidiary of U.K.-based BAE Systems Plc, Hudson was responsible for 43% of the company's revenue in 2011. Her business covers a wide array of areas: it's the largest provider of thermal weapon sights, built a smartphone app that helps natural disaster victims apply for federal aid, processed some 110 million e-filed tax returns for the IRS in 2011, and powers New York City's hybrid bus fleet.
This year's Most Powerful Women are shaping the future of technology, defense, and media.
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