Dr. Zimmer

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

Fallout 3
Dr. Zimmer was born in 2219. Zimmer is the head of the Institute's Synth Retention Bureau, and is therefore responsible for the whereabouts of every courser. After the escape of the advanced courser A3-21, Zimmer personally traveled to the Capital Wasteland in pursuit of the missing synth, ending up in Rivet City. He is, without exception, always in the company of his bodyguard, the courser Armitage.

After arriving in Rivet City, Zimmer spent the majority of his time in Rivet City's science lab, where he demanded the attention of Dr. Madison Li, in hopes of gaining her assistance finding A3-21. However, Zimmer was constantly refused, yet continued to loiter in the science lab in hopes of hiring a mercenary to do his dirty work for him. Zimmer appears disgusted with the citizens and conditions of Rivet City, as he is used to the clean, polished lifestyle of the Institute.

He stays in Rivet City even after Li has left.

Fallout 4
In Fallout 4 he is mentioned to be the director of the "Synth Retention" department of the Institute in the Commonwealth. He is currently on assignment to an "unknown location" (it is hinted that Zimmer has not been seen since leaving for the Capital Wasteland in 2277, 10 years prior to the events of Fallout 4). In his place is acting Director Justin Ayo.

Quests
The Replicated Man: Zimmer wants you 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.