Karen Koellner Author

Hilda Borko is a professor of education at Stanford University and past president of the American Educational Research Association (2003–2004). Jennifer Jacobs is a research faculty associate with the Institute of Cognitive Science at the University of Colorado at Boulder. Karen Koellner is a professor of mathematics education at Hunter College, City University of New York. Lyn E. Swackhamer is a research associate at RMC Research Corporation in Denver, Colorado.