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Marillyn Hewson
MPW defense marillyn hewson NEW
Company: Lockheed Martin
Title: President and CEO

Initially slated to become the defense company's COO next month, Marillyn Hewson received an unexpected promotion in November when president and incoming CEO Chris Kubasik resigned after the discovery that he had had an inappropriate relationship with a subordinate. Hewson, who takes over in January, has spent almost three decades at Lockheed Martin (LMT, Fortune 500) and currently runs its largest division, electronic systems.

  @FortuneMagazine - Last updated December 26 2012 12:09 PM ET
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