Annet Kossen moved to New York and studied painting at the School of Visual Arts there. A publisher asked her to do the illustrations for a cookbook, and once back in Holland, she got more illustration assignments. She designed a children's stamp, and illustrated the book 'Alfred Jodocus Kwak' by Herman van Veen. Between 1993 and 1995 she wrote and drew three comic books, 'Egel en Muis', about a porcupine and a mouse. These characters became so popular, especially with young children, that Annet Kossen also made it into a children's book, and started doing performances at elementary schools, reading from her book and drawing. Recently, she made her story into a puppet-show. 'Egel en Muis' have also appeared on the Dutch Sesame Street TV show, for which series her husband, Rob Crispijn, has written the songs.