Thomas R. Guskey is professor emeritus in the College of Education at the University of Kentucky. He began his career as a middle school teacher and school administrator in Chicago Public Schools. He later became the first director of the Center for the Improvement of Teaching and Learning, a national educational research center. Dr. Guskey served on the National Commission on Teaching & America's Future and the task force to develop National Standards for Staff Development, has been named a fellow in the American Educational Research Association (AERA) and was awarded AERA's prestigious Relating Research to Practice Award. He was also named the 2010 Jason Millman Scholar by the Consortium for Research on Educational Assessment and Teaching Effectiveness (CREATE). He is author or editor of 24 books and more than 250 book chapters and articles. Susan M. Brookhart is professor emerita in the School of Education at Duquesne University and an independent educational consultant and author based in Helena, Montana. She is author or coauthor of 18 books and more than 70 articles and book chapters on classroom assessment, teacher professional development, and evaluation. She serves on the editorial boards of several journals and on several national advisory panels. She has been named the 2014 Jason Millman Scholar by the Consortium for Research on Educational Assessment and Teaching Effectiveness (CREATE) and is the recipient of the 2015 Samuel J. Messick Memorial Lecture Award from ETS/TOEFL. Dr. Brookhart received her PhD in Educational Research and Evaluation from The Ohio State University, after teaching in both elementary and middle schools.