**Arthur Hyde **is the author or coauthor of the Heinemann titles *Understanding Middle School Mathematics*; *Comprehending Math;* *Best Practice, *Fourth Edition; and *Mathwise*. A professor of mathematics education at National-Louis University, he received its Excellence in Teaching award. While teaching high school mathematics in Philadelphia, he developed a variety of creative methods for teaching math. He also obtained a doctorate in curriculum and instruction from the University of Pennsylvania , where he later was Associate Director of Teacher Preparation. He continues to work frequently in elementary and middle school classrooms and conducts extensive professional development programs on mathematics and problem solving in Chicago and its surrounding school districts.