Harald Siepermann studied art at the Folkwang-Hochschule in Essen. Upon graduation in 1987, he set up his own storyboard studio, through which he worked for film and advertising studios in Düsseldorf, London and Zürich. It was during this period that he met the Dutch entertainer Herman van Veen. He was responsible for the final design of 'Alfred Jodocus Kwak', the little duck that Van Veen had created for a theatre show in the 1970s. The character conquered the world in an animated cartoon series of 52 episodes between 1989 and 1991, and in merchandising and comic books. Siepermann produced the character art, while the backgrounds were drawn by Hans Bacher.
Furthermore, Siepermann has worked as a character designer on Disney films like 'Who Framed Roger Rabbit?', 'Tarzan', 'Mulan' and 'The Emperor's New Groove'. In 2002, he briefly drew the comic strip 'Mecki' for Hörzu, but his tenure on the strip ended abruptly after a couple of months. He made his directorial debut in 2010 with the animation film '7 Zwerge - Der 7bte Zwerg' for Zipfelmützenfilm in Hamburg.
As a teacher with the Hambruger Animation School, the German Film School, the Games Academy, the Fachhochschule Mainz and the Filmakademie Baden-Württemberg since the 1990s, Siepermann has been a mentor and source of inspiration for many. Sadly, he passed away after a long period of illness in February 2013 at the age of 50.