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Gwendolyn Zimmermann, PhD, is director of assessment, research, and evaluation at Adlai E. Stevenson High School District 125, a model professional learning community district in Lincolnshire, Illinois.

Guy Barmoha is director of the Department of the Mathematics, Science, & Gifted Department at Broward County Public Schools, Florida. Previously, he was an elementary mathematics curriculum supervisor.

Greg Kushnir is an educational leader and presenter with over three decades of dedicated service in public education, specializing in oral language, reading, and writing disabilities. He is committed to enhancing educational outcomes for all students.

Gerry Varty has served as a classroom teacher, principal, director of curriculum and instruction, assistant superintendent (learning and system improvement), and executive director of professional development.

Geri Parscale spent 28 years in education and has worked as a classroom teacher, principal, professional development director, and finally deputy superintendent of Fort Leavenworth Schools, USD 207. Her mode of operation was always the same: learning for all kids.

George J. Roy, PhD, is an associate professor of mathematics education at the University of South Carolina. He teaches mathematics methods courses in the Department of Instruction and Teacher Education.

Gayle Karhanek, an author and a consultant, was director of student services at Adlai E. Stevenson High School in Lincolnshire, Illinois, from 1979 to 2004.

Gayle Gregory, a former teacher, has extensive experience as a staff developer and administrator. She has taught at the elementary, middle, and high school levels as well as in university settings.

Gayle Allen, EdD, is an experienced educator, researcher, and author who helps educational leaders drive transformative change. Using theory, practice, and humor, she challenges teams to become collaborative, data-driven, and digitally connected.

Garrick Peterson helps teachers and administrators become high-functioning PLCs with a specific focus on making the connection between assessment and intervention.