▁board ▁of ▁direct ors , ▁succeed ing ▁V ance ▁D . ▁C off man . ▁He ▁was ▁elected ▁chairman ▁on ▁April ▁ 2 8 , ▁ 2 0 0 5 , ▁retain ing ▁his ▁previous ▁respons ib ilities ▁as ▁president ▁and ▁CE O . ▁Over ▁the ▁course ▁of ▁his ▁ten ure ▁at ▁Lock he ed , ▁Stevens ▁held ▁a ▁variety ▁of ▁executive ▁positions , ▁including ▁chief ▁operating ▁officer , ▁chief ▁financial ▁officer , ▁and ▁head ▁of ▁strateg ic ▁planning . ▁On ▁April ▁ 2 6 , ▁ 2 0 1 2 , ▁it ▁was ▁announced ▁that ▁he ▁would ▁be ▁ret iring ▁in ▁December ▁ 2 0 1 2 ▁with ▁then ▁president ▁and ▁CO O ▁Chris ▁Kub as ik ▁being ▁promoted ▁to ▁CE O ▁effective ▁January ▁ 1 , ▁ 2 0 1 3 . ▁ ▁However , ▁in ▁November ▁ 2 0 1 2 , ▁an ▁eth ics ▁viol ation ▁forced ▁Chris ▁Kub as ik ▁to ▁res ign , ▁effectively ▁making ▁Mar illy n ▁H ew son ▁( then ▁Executive ▁Vice ▁President , ▁Electron ic ▁Systems ) ▁the ▁new ▁president ▁and ▁CO O ▁immediately , ▁with ▁her ▁taking ▁the ▁hel m ▁as ▁CE O ▁in ▁January ▁ 2 0 1 3 . ▁Stevens ▁was ▁elected ▁to ▁remain ▁as ▁executive ▁chairman ▁through ▁ 2 0 1 3 . ▁ ▁In ▁January ▁ 2 0 1 2 , ▁he ▁was ▁appointed ▁by ▁President ▁Bar ack ▁Ob ama ▁to ▁the ▁Ad vis ory ▁Committee ▁for ▁Trade ▁Policy ▁and ▁Neg oti ations ▁and ▁was ▁chairman ▁of ▁the