Nancy C. Jordan is Professor of Education (Learning Sciences) at the University of Delaware. She is Principal Investigator of the Number Sense Intervention Project (funded by the National Institute of Child Health and Human Development) as well as the Center for Improving Learning of Fractions (funded by the Institute of Educational Sciences). She is author or co-author of many articles in children’s math and has recently published articles in Child Development, Journal of Learning Disabilities, Cognitive Development, Developmental Science, Developmental Psychology, Journal for Research in Mathematics Education, and School Psychology Review. Dr. Jordan received her doctoral degree from Harvard University and completed a post-doctoral fellowship at the University of Chicago. Based on her research, she developed a teacher-friendly kindergarten number sense screener and an intervention program for high-risk children (Brookes Publishing). Recently, Professor Jordan served on the Committee on Early Childhood Mathematics of the National Research Council of the National Academies and on the panel of IES practice guide on teaching math to young children. Her son, Nicholas, is an undergraduate student at the University of Delaware.