Eva Thanheiser, Ph.D. is an assistant professor of mathematics education at Portland State University. Her research interests include preservice elementary/middle school teacher preparation with a focus on content knowledge for teaching mathematics.

Christine A. Browning, is a professor of mathematics education at Western Michigan University.� Her research interests include the development and assessment of technology-rich mathematics curriculum materials for pre-service and in-service elementary/middle school teachers.�

Meg Moss, Ph.D. is an assistant professor of Mathematics Education and Department Chair of Education at the University of North Carolina at Asheville.  Her research and teaching interests include ways that preservice elementary teachers develop content knowledge for teaching mathematics.

Tad Watanabe is an associate professor of Mathematics Education at Kennesaw State University.� His research interest include elementary school teachers' content and pedagogical knowledge and teaching/learning of multiplicative concepts.

Gina Garza-Kling teaches content and methods courses for future elementary and middle school teachers at Western Michigan University.� She is interested in helping pre-service and in-service teachers deepen their knowledge of teaching mathematics for understanding.