He has had a recurring role in the RTL Television series Hinter Gittern – Der Frauenknast.

Ziesmer is best known for dubbing over Jaleel White as Steve Urkel in Family Matters, Ren Höek in The Ren & Stimpy Show (alongside Oliver Feld's Stimpy), and SpongeBob SquarePants in the official German dub.

He is the German voices of Wakko Warner from Animaniacs and Dale Gribble from King of the Hill.

He has supplied his voice to a number of Disney productions, including the German dub of DuckTales as Dewey and the Winnie-the-Pooh series as Piglet, and Beauty and the Beast as LeFou.

Steve Buscemi Tom Kenny Alec Mapa John Fiedler Jaleel White Tony Cox Conrad Vernon Danny Woodburn Anthony Michael Hall Verne Troyer Travis Oates Michael J. Anderson Rob Paulsen Frank Welker