Bath Iron Works President Jeffrey S. Geiger has been named president of Electric Boat effective Nov. 4, replacing Kevin J. Poitras, who will retire. Both companies are divisions of General Dynamics.

Frederick J. Harris, president of General Dynamics’ shipyard in San Diego, known as NASSCO, will take over as president of BIW and continue in his NASSCO position.

Michael J. Mulligan, president of General Dynamics Armament and Technical Products, will remain a vice president there, and will become vice president and general manager of BIW.

Geiger, 52, became president of BIW in 2009 after joining the company in 1984 as a production planner. He held positions in production, engineering, manufacturing, planning and quality assurance.

Geiger is a graduate of the University of Michigan, where he earned bachelor’s and master’s degrees in naval architecture.

Harris, 68, became president of NASSCO in 2006. Previously, he was senior vice president of programs at Electric Boat, where he was responsible for the execution of all submarine design and construction programs.

Harris joined the company in 1973 as a senior engineer on the Trident ballistic missile submarine program. He graduated from Maine Maritime Academy in 1967 with a bachelor’s degree in marine engineering and holds a master’s degree in business administration from Babson College.

Mulligan, 50, became president of General Dynamics Armament and Technical Products in November 2006. He first joined the company in July 2006 as vice president of operations after 20 years at Electric Boat, where he worked on the design, development and production of nuclear submarines.

Mulligan holds a bachelor’s degree in mechanical engineering from the University of Lowell, a master’s degree in mechanical engineering from Rensselaer Polytechnic Institute and a master’s degree in business administration from the Massachusetts Institute of Technology.