Doris Schattschneider is Professor Emerita of Mathematics at Moravian College in Bethlehem, Pennsylvania, where she taught for 34 years. Her dual interest in geometry and art led naturally to the study of M.C. Escher’s work. Active as a teacher, lecturer, editor, and writer, she has published widely on Escher’s work. Her book M.C. Escher: Visions of Symmetry gives a complete account of Escher’s symmetry work, and includes color photographs of all 150 of Escher’s symmetry drawings.