François Siener is a French actor born on May 14, 1951, who is primarily known for his extensive work in voice acting, particularly in the dubbing of foreign films, television series, and animation into French. His career encompasses both live-action performances and a significant body of voice-over work for theater, TV series, and animated features.

In the realm of anime, Siener is most prominently recognized as the French voice of the iconic character Joseph Joestar in the anime series JoJo's Bizarre Adventure. His contributions to anime dubbing also include roles in several acclaimed films from Studio Ghibli. He voiced Gonza in Princess Mononoke, Gonta in Pom Poko, and Seijirô Inui in the film Paprika. His other animation voice credits include Luis in the Dofus and Wakfu animated projects, Ugly Barrow in Go West: A Lucky Luke Adventure, and Voxem in Kaena: The Prophecy.

Beyond anime, Siener has been a prolific voice in French dubs for live-action film and television. He is known as one of the regular French voices for actors M. C. Gainey, Ron Perlman, Lance Henriksen, and Sam Elliott. His work also extends to video games, where he provided the French voice for the narrator in the acclaimed titles Fallout 3 and Fallout: New Vegas.

Siener's involvement in the Transformers franchise, where he voiced the characters Megatron and Terrorsaur in the first season of the Beast Wars series, represents another notable aspect of his career. These roles were subsequently taken over by another actor for the second season. His on-screen acting credits include appearances in French television series and films such as The Bodyguard and Résidence surveillée.