Marillyn Hewson to step down as Lockheed Martin CEO

Marillyn Hewson is stepping down from the top spot with Bethesda defense giant Lockheed Martin Corp. (NYSE: LMT). She will be replaced as president and CEO by James Taiclet, the current top exec of Boston real estate investment trust American Tower Corp. (NYSE: AMT). Hewson, 66, who has served as chairman, president and CEO since 2014, will become executive chairman when Taiclet, 59, steps into his new role with Lockheed on June 15. Taiclet has been a Lockheed board member since 2018. "I know…