Nathan Dadey, Ph.D. is a Senior Associate at the Center for Assessment. His work focuses on the design, scaling, and use of educational assessments, particularly assessments used for accountability purposes. His work addresses issues that threaten the validity of assessment and accountability operational programs. Dr. Dadey uses psychometric and statistical methods to manage practical problems, including issues related to combining interim assessment data, dimensionality of alternative assessments, subscores, and vertical scales. He aims to produce methodological and applied work that contributes to improved understanding and use of assessment results in policy contexts.

Yun-Kyung Kim is a doctoral student at the University of California, Los Angeles in the Social Research Methodology division with an emphasis on advanced quantitative methods. She received a Master's degree in Educational Measurement and Evaluation from Seoul National University. Ms. Kim has been involved in the design and implementation of measurement and evaluation studies, with application of latent variable models including item response theory models. Her research focuses on latent variable models for longitudinal data and inferences on growth, change, and future trajectory, mainly in the context of English language proficiency assessment and admission setting.

Brian Gong, Ph.D. is co-founder and Senior Associate at the Center for Assessment. He has been involved with creating policies, models, and criteria for promoting validity, reliability, and credibility in both assessments and accountability systems. Dr. Gong has helped develop solutions including educationally valuable and technically defensible state accountability systems and innovative assessments (e.g., science performance, writing portfolio, learning progressions, growth, non-cognitive, comprehensive assessment systems). He was a member of the committee tasked with revising the Standards of Educational and Psychological Testing and was the co-author of content methodology to implement the CCSSO Criteria for Procuring and Evaluating High-Quality Assessments.

Edynn Sato, Ph.D. is CEO of Sato Education Consulting LLC and also is Director of Psychometrics & Research for WIDA at the University of Wisconsin-Madison. She is an experienced Peer Reviewer of State Assessments for the U.S. Department of Education, serves on several technical advisory committees, recently was co-Principal Investigator of a grant  and lead designer for an alternate English language proficiency assessment, and she has contributed substantively to the development of a number of other large-scale assessments for accountability. Her research focuses on academic English language processes, opportunity structures and cultural responsiveness, and assessment fairness and validity, with particular interest in alternative and innovative ways to measure what multilingual learners and students with disabilities know and can do.