Catharina Valckx was born in 1957 in De Bilt, Netherlands. She grew up in France with four sisters. She traveled back and forth between the two countries before settling down in Amsterdam. She started writing for children books after the birth of her son. Her books are like guides for a happy life. She believes (and has observed) that children are already sensitive to an absurd kind of humour at a very young age, the kind of humour that makes you smile not laugh, a comforting kind of humour.