Willem Ritstier was born in Rotterdam, Holland, and was published in several magazines and newspapers. A self taught artist, Ritstier began his career in Robbedoes (the Dutch equivalent of Spirou) with the gag strip 'Bartje', and the series 'Harry Lipwitts'. He was also present in Eppo/Wordt Vervolgd with 'Gaaibaai'. He has published in Algemeen Dagblad, Telegraaf, Leeuwarder Courant and a number of intern publications for corporations like KLM and Philips. Ritstier drew 'Dirkje' in the supermarket magazine Ditjes & Datjes, 'Co & Wattje' for Eneco and 'Alvin' and 'Rick Rolluik' for Suske & Wiske weekly magazine. His comic 'De Familie Iks' was published weekly in De Courant Nieuws van de Dag.
Ritstier is also a versatile comics writer. With Minck Oosterveer, he has created the newspaper comic 'Zodiak in De Telegraaf, but also 'June May', 'Claudia Brücken', 'Jack Pott', 'SpeedBallNation', 'Rick Rolluik' and 'Nicky Sax'. With René Uilenbroek, he cooperated on the superhero parody 'Soeperman', as well as 'Stanley'. In addition, Ritstier has worked for magazines like Tina and Samson.