Marc Seidenberg, also known as Mark Seidenberg, is a German voice actor born in 1969 with an extensive career in audio drama and dubbing. He came to prominence in the early 1980s as a child voice actor for the title character Aki in the youth crime series Detektiv Kolumbus & Sohn and as Ben in Enid Blyton's Die verwegenen Vier von Europa. In anime, Seidenberg is notably the German voice of Maruo-kun in the series Chibi Maruko-chan. His body of work includes some of the most recognized titles in the anime industry; he provides the German voice of Kotarou Katsura in the long-running series Gintama, a role he has reprised for the film adaptations Gintama: The Movie and Gintama: The Final. He also voiced Gregory in The Irregular at Magic High School, Mitchal Rubinstein in Heat Guy J, Roy B. Dipper in the Burn the Witch movie, and Susuki in a Naruto Shippūden film. Beyond anime, Seidenberg voiced Roger Klotz in the Nickelodeon series Doug and Larry Romano in the American sitcom The King of Queens. He also lends his voice to the horse Kleiner Donner in the animated series Yakari. His more recent anime credits include roles in ACCA: 13-Territory Inspection Dept., B: The Beginning, How Heavy Are the Dumbbells You Lift?, and a guest role as a doctor in an episode of Mushoku Tensei: Jobless Reincarnation.