Charles Li Author

Alfred S. Posamentier has published over sixty books in the area of mathematics and mathematics education, including, most recently, The Circle- A Mathematical Exploration beyond the Line (with Robert Geretschloger). After having been on the faculty of the City College of the City University of New York for forty years, where he was a professor of mathematics education and dean of the School of Education, he subsequently held the same positions at Mercy College, New York, for five years. He is currently Chief Liaison for International Academic Affairs at Long Island University.
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Robert Geretschloger is a mathematics teacher at Bundesrealgymnasium Keplerstrasse in Graz, Austria. He is the coauthor of The Circle (with Alfred S. Posamentier), Geometric Origami, and other works.aaaa

Charles Li is an Assistant Professor of Mathematics at Mercy College. He earned his Ph.D. in Mathematics from the CUNY Graduate Center, and his B.Eng. in Electrical Engineering from Cooper Union.
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Christian Spreitzer teaches mathematics and physics at the University College of Teacher Education in Lower Austria.