Caligari was working as a scientist.
Edgar Caligari is the "doctor" who the team finds at the weird medical and scientific lab. He was trying to merge an extra hand onto his body, although the hand had zombie cells and Dr. Edgar was transformed into a type of franken-zombie. As the team finds him, he tells them that he doesn't know how, but they are on the right track and Warren is leading them correctly. He asks for Mercy and they deliver it.