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Mark Ellis, Ph.D., NBCT, is a professor of education at California State University, Fullerton and K–12 mathematics education scholar. He has written more than 40 publications and served on the National Council of Teachers of Mathematics (NCTM) Board of Directors and Executive Committee. Mark is a coauthor of Ready® Classroom Mathematics and his latest book is about creating productive mathematics learning environments for elementary students. You can find him on Twitter @EllisMathEd.