Douglas H. Clements is Distinguished University Professor and Kennedy Endowed Chair in Early Childhood Learning at the University of Denver, Colorado, U.S.A. Dr. Clements has published over 185 refereed research studies, 30 books, 107 chapters, and 300 additional works on the learning and teaching of early mathematics; creating, using, and evaluating research-based curricula; and taking interventions to scale. Dr. Clements has served on six national research committees for the National Academies of Sciences, Engineering (NASEM, including NRC AND IOM), as well as on the President’s National Mathematics Advisory Panel, and the Common Core State Standards committee (NGA, CCSSO), and is co-author of each of the reports. Additional information can be found at http://du.academia.edu/DouglasClements and http://www.researchgate.net/profile/Douglas_Clements/