Maarten DolkMaarten Dolk is a researcher and developer at the Freudenthal Institute for science and mathematics education in the Netherlands. He is involved in the development and research of in-service and multimedia in-service materials for teachers, staff devlopers, and teacher educators in a number of countries. He has been a collaborating partner in Mathematics in the City since its inception and is co-author of the first three books in the Young Mathematicians at Work series. Read More Read Less