1. DEBORAH LOEWENBERG BALL received her PhD from Michigan State University, where she is currently an associate professor of teacher education. With elementary school mathematics as the primary context, her research focuses on the challenges of teaching for understanding and on efforts to support such teaching through policy, reform initiatives, and teacher education. Address: Deborah Loewenberg Ball, 116K Erickson Hall, Michigan State University, East Lansing, MI 48824.