Piet Deunhouwer was born in Utrecht and studied at the Art Academies of The Hague and Rotterdam. At the age of seventeen, he saw his first comic strip, about the young soccer player 'Koos', published in Wim Meuldijk's De Ketelbinkiekrant. Unfortunately, Deunhouwer was drafted for army service and was unable to finish the comic, which ended abruptly, and was soon replaced by another soccer comic, Henk Sprenger's 'Kick Wilstra'.
After his service in the army, Deunhouwer found jobs with advertising agencies like Jan Grijsseels and De La Mar. In the fifties, he created the newspaper comic 'Gerrit Tof en de Witte Raaf' for Het Rotterdams Nieuwsblad. He did a lot of commercial work, including work for Fibo Beeldonderwijs.
He was one of the few Dutch artists to develop a three-dimensional comic, called 'Dick Gable', for Santos, a bubblegum factory from Breda. Deunhouwer became an art teacher at schools in The Hague and Drachten. He has been painting since 1962 and was also a member of the Hague collective Pulchri Studio. He still devotes most of his time to painting in his home atelier in the Frisian town of Lippenhuizen.