Captain Wes is the highest-ranking known member of Gunners, operating the organization from their headquarters in Gunners plaza.
Impressed by Clint after he betrayed the Commonwealth Minutemen during the Gunners' invasion of Quincy, known to surviving Minutemen as the Quincy Massacre, Wes appointed Clint as commander of the Gunner group in Quincy and also supported him with two of his favorite mercenaries, Tessa and Baker.
Wes is located behind a Master lock door in the Gunners Plaza.
While killing the courser to get into the Institute, although he is not even present Wes' voice can be heard over the intercom commanding Gunners. This voice can also be heard in other locations even after Wes is dead.