Dr. Warren Douglas Crown is Professor Emeritus of Mathematics Education, Graduate School of Education, Rutgers University, New Brunswick, New Jersey. He received his Ph.D. from the University of Chicago in 1977. His Ph.D. thesis was titled *The effects of three different remedial environments on the place value concepts and computation skills of elementary children*. He is a member of the authorship teams for many elementary textbook programs, together with Randall Charles, Francis Fennell, Janet Caldwell, and Juanita Copley. He is an author for Scott Foresman-Addison Wesley enVisionMATH and enVisionMATH Common Core. Dr. Crown has won numerous awards for excellence in teaching as well as the Rutgers Presidential Award for Distinguished Public Service. His curriculum development efforts have resulted in many publications, both print-based and computer software.