Dr. Zimmer

Dr. Zimmer is the leader of the Institute's Synth Retention Bureau, who is temporarily staying at Rivet City in 2277.

Background
Born in 2219, Dr. Zimmer is the head of the Synth Retention Bureau on business from the Institute in the Commonwealth. In 2277, Zimmer left the Commonwealth and journeyed south to the Capital Wasteland in search of a missing android. Accompanied by his android bodyguard, Armitage, he made his way to Rivet City in the hopes that fellow scientist Dr. Madison Li could assist him in his search for his missing property.

Upon arrival to Rivet City and its science lab, Li personally refused him the right to speak with her, a conversation that had to be reiterated by her assistant, Anna Holt, citing that his constant interruptions were interfering with Li's hydroponic developments. Despite being refused assistance he remains within the lab, refusing to leave until Li "stops playing with her chemistry set and starts talking real science." He later enlisted the help of the Lone Wanderer to help him find his missing android.

As of 2287, Zimmer remains missing in action, with Justin Ayo filling his position at the SRB. According to Ayo, Zimmer is reclaiming "high profile" units in an unspecified location.

Quests
The Replicated Man: Zimmer wants the Lone Wanderer to hunt down a rogue android.

Other interactions
If Zimmer is convinced the android is dead, he will leave Rivet City and disappear from the game.

Appearances
Zimmer appears in Fallout 3 and is mentioned in Fallout 4.

Behind the scenes
A voice type exists for Zimmer in the game files of Fallout 4. Based on its form ID, Zimmer was originally slated to appear as a fully-fledged NPC in the Institute itself, though this was changed at some point in development.