Cathy Fosnot is Professor Emerita of Childhood Education and the Founding Director of Mathematics in the City, a nationally recognized center for professional development at the City College of New York. She has authored numerous books and articles on mathematics education, including most recently the Contexts for Learning Mathematics series and the Young Mathematicians at Work series. She is also co- author with Cathrine Kellison of A Parent’s Guide to Math Education in Today’s Schools. She currently serves as the senior content consultant for the award-winning internet math environment, DreamBox Learning and is the CEO of New Perspectives on Learning, and President of New Perspectives Online and New Perspectives on Assessment.
Maarten Dolk is a Dutch designer and researcher of mathematics education. Over the past 25 years, he has been associated with the Freudenthal Institute in the Netherlands, where he has been involved in the development of in-service materials for teachers and of multimedia learning environments for student teachers. Presently he is involved in mathematics education projects in Bangladesh, Indonesia, and the Philippines. Maarten is co-author of the first three books in the Young Mathematicians at Work series; he also coauthored two of the early childhood Contexts for Learning Mathematics units. Maarten is the CEO of New Perspectives Online.