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Havenstein joined BAE Systems in 2000 when the company purchased Lockheed Martin Aerospace Electronic Systems, including its Sanders subsidiary of which he was president. Aerospace Electronic Systems was renamed BAE Systems Information and Electronic Systems Integration, and Havenstein was named president. From 2003 to 2005 Havenstein was executive vice president for BAE Systems North America. In a major reorganization in 2005, BAE Systems North America was renamed BAE Systems Inc., and BAE Systems Information and Electronic Systems Integration was merged into the newly created BAE Systems Electronics and Integrated Solutions. Havenstein became president of this new operating group. As of June 26, 2009, Havenstein resigned as director and chief operating officer of BAE Systems plc and president and CEO of its subsidiary BAE Systems Inc after spending two years at the helm.