Alfred S. Posamentier is Professor of Mathematics Education and Dean of the School of Education of the City College of the City University of New York. He is the author and coauthor of more than 40 mathematics books for teachers, secondary and elementary school students, and the general readership. Dr. Posamentier is also a frequent commentator in newspapers on topics relating to education, and he works with mathematics teachers and supervisors, nationally and internationally, to help them maximize their effectiveness.