Susan Winebrenner, M.S., is a full-time consultant in staff development. She presents workshops and seminars nationally and internationally, helping educators translate educational research into classroom practice. Susan is also the coauthor of Teaching Kids with Learning Difficulties in Today's Classroom and The Cluster Grouping Handbook. She lives in San Marcos, California.

Dina Brulles, Ph.D., is a school administrator and the gifted-education director for Arizona's Paradise Valley Unified School District. She also assists districts throughout the United States in developing gifted-education programs. Other books Dina has coauthored include A Teacher's Guide to Flexible Grouping and Collaborative Learning and The Cluster Grouping Handbook. She lives in Peoria, Arizona.