Jean-Jacques Nervest is a French actor primarily known for his extensive work in theatre and voice acting. His career in the performing arts is rooted in stage performance, with numerous credits in theatrical productions in Paris spanning from 2013 to 2026, including works such as "En attendant Godot" and "Chez Raymonde". This background in live performance informs his work as a voice artist, where he has built a substantial career dubbing foreign films, television series, and animated productions into French.

In the realm of animation and video games, Nervest has provided voices for a wide array of characters. He voiced the character Globox, as well as Reflux, in the 2003 video game Rayman 3: Hoodlum Havoc and its promotional material. He is also a familiar voice in projects related to the Batman franchise, having voiced characters across multiple series and films. His roles in this universe include The Riddler and The Scarecrow in the 1968 animated series, Lucius Fox in Batman: The Animated Series from 1992 (a role he reprised years later for the French dub of the animated film Batman: Gotham Knight), and Derek Powers / Blight in Batman Beyond. He has also contributed voices to the Batman: Arkham video game series, taking on roles such as Aaron Cash and Hush.

Beyond these franchises, Nervest's voice can be heard in a diverse range of other works. He provided voices for the animated films Bécassine, le trésor viking and Babar, King of Elephants. His live-action dubbing credits are equally extensive, where he has lent his voice to American actors in numerous films and television series. Examples include dubbing for the films Armageddon, Star Wars: Episode I – The Phantom Menace, and Pirates of the Caribbean: The Curse of the Black Pearl. On television, he has provided French voices for characters in long-running series such as Once Upon a Time, Days of Our Lives, The Young and the Restless, and The Wire. He has also dubbed actor Kevin Dunn in films like Unstoppable and Suspect.