Dr. Art Johnson has had a wide range of experience in mathematics education. He taught middle and high school mathematics for over thirty years before moving to Boston University. While at Boston University, Dr. Johnson taught undergraduate and graduate courses in mathematics education. He is presently a professor of mathematics for Metropolitan College at Boston University. Dr. Johnson has written over forty books and twenty-five journal articles that span many topics in mathematics education, from mathematics history and geometry to manipulatives and English language learners.