Eefje graduated from the HKU (School of the Arts Utrecht) in 2002, and has worked as a freelance illustrator ever since. She makes bright and colourful illustrations for books, children's magazines and much more. She has worked for a variety of publishers internationally, including Scholastic (US), Clavis (Belgium), Uitgeverji Moon and Caro for Kids (Netherlands), and many more. She lives in Breda, Netherlands, with her partner Philip, son Guus, daughter Fien and her dog Jip.