Hewson was born in Junction City, Kansas. She earned her Bachelor of Science degree in business administration and her Master of Arts degree in economics from the University of Alabama. She also attended the Columbia Business School and Harvard Business School executive development programs.
Hewson joined Lockheed Martin in 1982. She has held a variety of increasingly responsible executive positions with the company, including President and Chief Operating Officer, and Executive Vice President of Lockheed Martin’s Electronic Systems business area. On November 9, 2012 she was elected to Lockheed Martin’s Board of Directors. Hewson has been the CEO since January 2013. She also serves on the Board of directors for Sandia National Laboratories and DuPont.
- "Lockheed Martin Board Elects Marillyn Hewson CEO & President and Member of the Board Christopher Kubasik Resigns". Sacramento Bee. November 9, 2012. Retrieved 10 November 2012.
- "Lockheed Martin Corporate Bio: Marillyn A. Hewson". Retrieved 2013-03-19.
- "Fortune Magazine's 2012 "50 Most Powerful Women in Business"". Retrieved 2013-03-19.
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