Brian W. Junker is Professor of Statistics, Carnegie Mellon University. Dr. Junker received his Ph.D. in statistics from the University of Illinois in 1988. He came to Carnegie Mellon University in 1990, where he began as a postdoctoral fellow in the Program in Psychiatric Statistics, jointly operated by the Department of Statistics at Carnegie Mellon and Western Psychiatric Institutes and Clinic, University of Pittsburgh. During the 1999-2000 academic year, he as a Visiting Research Scientist at the Learning Research and Development Center, University of Pittsburgh. His research interests include the statistical foundations of latent variable models for measurement, as well as applications of latent variable modeling in the design and analysis of standardized tests, small-scale experiments in psychology and psychiatry, and large scale educational surveys such as the National Assessment of Educational Progress. Dr. Junker is a Fellow of the Institute of Mathematical Statistics, a member of the Board of Trustees and the Editorial Council of the Psychometric Society, an associate editor and editor-elect of Psychometrika. He also served on the National Research Council (NRC) Committee on Embedding Common Test Items in State and District Assessments, and served as a consultant to the NRC Committee on the Foundations of Educational and Psychological Assessment. He is currently a member of the Design and Analysis Committee for the National Assessment of Educational Progress.