Stanislaus Braun Doctor Stanislaus Braun is the Overseer of Vault 112 , locked by his own choice in a Vault - Tec prototype simulation in which he appears as a little girl named Betty . Before the Great War , he was a brilliant German Vault - Tec scientist , the head of Future - Tec and the creator of the Garden of Eden Creation Kit . Background . A preeminent scientist , Doctor Braun headed up many astonishing experiments in his long and varied career , but of most interest were his theories on advanced life preservation . It is said that the U . S . Army had contracted Braun to develop various methods of sustaining human life in case of an atomic war . When the war did come , Braun escaped to the safety of Vault 112 and is there to this day , his wizened and wrinkled form given new ( virtual ) life as a little girl named Betty . Born in the town of Kronach , Bavaria , Germany , Dr . Braun was the Director for Vault - Tec ' s Societal Preservation Program , and notes from other vaults suggest that he was an outside point of contact for Overseers during the Vault Experiment , either as administrative authority or expert scientific adviser . Though early correspondence showed him taking a larger role in activation and assignment of the vaults , much of his responsibility has lapsed as he has become more immersed in , and obsessed with , the sole administration of Vault 112 ' s virtual reality experiment . For the past two centuries , Braun has been repeatedly creating and exploring new simulated worlds such as " Toucan Lagoon " and " Slalom Chalet , " but often becomes bored and began manipulating the simulations to impose cruelty on the other vault dwellers in the simulation , as an attempt to entertain himself . A failsafe terminal in Tranquility Lane shows that Braun commissioned the " Chinese Invasion Failsafe , " a means of permanently killing the inhabitants of Vault 112 , but ( much to his disappointment ) it will not kill him , which would leave him trapped alone in the simulation . In the current simulation world of pre - War " Tranquility Lane " , Braun has taken up the identity of a little girl named " Betty " in another attempt to entertain himself - in the simulator he can be anything he wishes to be , and he happens to feel like trying out the form of a young girl . As " Betty " , Braun speaks in the perfectly simulated voice of a real little girl but once he is revealed , he tends to alternate between the " Betty " voice and his real voice . Most of the residents of Tranquility Lane are unaware of Betty ' s nature , though a few are vaguely aware she ' s important and one child says " she ' s mean . " The only person who is aware of Betty ' s true nature is Old Lady Dithers . When James approached him for assistance in retrieving the one usable G . E . C . K . in the Capital Wasteland , Braun trapped him in a simulator pod . Personality . Portrayed as a narcissist and a psychopath , Braun is arrogant and has a tremendous ego , an inflated sense of his own intelligence , and anger problems . He lashes out over perceived slights , believes that he is always right , and answers even simple questions with lengthy digressions . He also has a sadistic side , lacks any empathy for his victims in the simulation , and does not have any mercy as he views the helpless Vault 112 inhabitants as mere playthings for his own amusement . Braun views death in the simulation as a minor deterrence as he can normally resurrect them at any time he desires . Appearances . Stanislaus Braun appears only in " Fallout 3 " . He is mentioned in " Fallout 4 " in a terminal entry in Vault 75 , and in the " Vault - Tec Workshop " add - on by Valery Barstow .