Haydé was born in Cologne in 1956. She graduated from the graphic design department at the Ecole Cantonale d’Art de Lausanne. She worked for ten years as an illustrator for the magazine L’Hebdo. Since 1997 she has been the illustrator of the picture book series Milton. The first volume of this collection won the Most Beautiful Swiss Books competition. In her studio in Lausanne she designs posters for the Petit Théâtre and regularly works on city council projects having to do with children and health. She mainly works in the fields of illustration and painting.