Marije Tolman studied graphic and type design at the Royal Academy in The Hague, and illustration and design at the Edinburgh College of Art, in Scotland. Her picture books are published in many countries, including Denmark, Germany, Brazil, Italy, France, Spain, Portugal, South Africa, Mexico, South Korea, Qatar, Japan, and China. She lives in the Netherlands.

Nancy Forest-Flier is an American-born translator and editor living and working in the Netherlands. She has translated several adult and children's novels from Dutch to English, as well as books of historical nonfiction. She has also translated for numerous Dutch museums and institutes, including the Anne Frank House. She has six children and ten grandchildren.