The board of directors of General Dynamics has elected Christopher Marzilli to be executive vice president of the Information Technology and Mission Systems segments, effective January 1, 2019, to succeed S. Daniel Johnson, who has informed the company of his intent to retire on December 31, 2018. Christopher J. Brady, vice president of engineering for General Dynamics Mission Systems, will succeed Marzilli as president of General Dynamics Mission Systems. Marzilli has been the president of General Dynamics Mission Systems since January 2015, and became a vice president of General Dynamics in January 2006. Prior to being named president of Mission Systems, he was president of General Dynamics C4 Systems, from 2006 to 2014. Marzilli joined GTE Government Systems in 1981, and held positions of increasing responsibility in program management, before becoming a deputy general manager in 2003. Brady is vice president of engineering for General Dynamics Mission Systems, responsible for all engineering execution and technology roadmaps. Previously, he served as the general manager of the company's Assured Communications Systems business area and director of radio products. Brady joined a division of Motorola in 1993, which was later acquired by General Dynamics in 2001.