Stefan Müller-Doriat is a German actor and voice actor born in Stuttgart in 1982. He completed his professional acting training at a state-recognized school in Stuttgart from 2003 to 2006. His career is built on a strong foundation in theater, with numerous performances at venues such as the Schauspielbühnen Stuttgart, the Komödie im Marquardt, and the Freilichtspiele Schwäbisch Hall, appearing in both classic and contemporary plays. He has also developed a specialization in stage combat and fight choreography, skills he applies in both theater and film. In 2021, he was awarded the Monica Bleibtreu Theaterpreis.

In addition to his stage work, Müller-Doriat has an extensive career in voice acting for German dubs. He is the German voice of Hermes in the anime series Is It Wrong to Try to Pick Up Girls in a Dungeon? and its associated film, Arrow of the Orion. His other anime voice work includes roles in series such as Knights and Magic, Sengoku Night Blood, and On-Gaku Our Sound. Beyond animation, his voice can be heard in major video game titles like Final Fantasy VII Rebirth and Call of Duty, as well as in children's programs such as Blippi and various documentaries for broadcasters like ARTE and SWR. His recurring collaborations as a voice actor include work for the publisher Anime House.