Paul Trafton is a professor in the mathematics department and Fellow in the Regent's Center for Early Developmental Education at the University of Northern Iowa. His long-term interest in primary mathematics led to his chairing the K-4 writing team of the Curriculum and Evaluation Standards for School Mathematics (NCTM, 1989).
Diane Thiessen is a professor in the mathematics department at the University of Northern Iowa. She has designed undergraduate and graduate mathematics education programs, authoredelementary math methods textbooks, and worked as a member of the Evaluation of Mathematics Teaching group for the Professional Teaching Standards (NCTM, 1991).