He began his career working for an advertising agency in Zurich. After traveling around Canada and Mexico, he returned to Switzerland and worked as a freelance graphic artist.

Much of his writing is done in his spare time, but he has still managed to write and illustrate a number of award-winning childrens books featuring his much loved creations Penguin Pete and his family, Hopper the rabbit, Dazzle the dinosaur and the Rainbow Fish.

Pfister is also an accomplished sculptor and photographer.