CNBCNorthrop Grumman CEO Wes Bush to step downCNBCNorthrop Grumman chairman and CEO Wes Bush announced on Thursday he will step down as CEO effective Jan. 1, but will remain chairman through July 2019. Kathy Warden, who currently acts as company president and COO of the global security ...Northrop Grumman CEO to step down, COO to take overMarketWatchNorthrop Grumman Announces CEO TransitionNasdaqall 15 news articles »