Michael J. Kolen is professor of Educational Measurement at the University of Iowa. Previously, Dr. Kolen served as President of the National Council on Measurement in Education (NCME), and is currently editor of the Journal of Educational Measurement. He served on the faculty at Hofstra University from 1979-1981, and he worked at American College Testing (ACT) from 1981-1997, including being Director of the Measurement Research at ACT from 1990-1997. He is a Fellow of Division 5 of the American Psychological Association and member of various other professional organizations. Dr. Kolen co-authored the book Test Equating: Methods and Practices, published by Springer-Verlag. He has published numerous articles and book chapters on various topics in educational measurement and statistics, including test equating and scaling. Dr. Kolen received his doctorate from the University of Iowa in 1979, his MA degree from the University of Arizona in 1975, and his BS degree from the University of Iowa in 1973.