Authors & Presenters

Cassandra Erkens is the author of eight books with more currently in progress, as well as chapters in several anthologies. Additionally, she is a facilitator, a trainer of trainers, an educator, and a coach. Her work focuses on educational topics, including assessment, instruction, leadership, school improvement, and professional learning communities.

Tom Hierck has been an educator since 1983, and his career has spanned all grade levels and many roles in public education. He has presented to schools and districts across North America with a message of celebration for educators seeking to make a difference in the lives of students.

Phillip Page, EdD, is the superintendent of the Bartow County School System in Cartersville, Georgia. His experience spans more than 30 years and includes serving as a biology teacher, high school assistant principal, middle school and high school principal, and assistant superintendent.

Douglas Reeves, PhD, has worked with education, business, nonprofit, and government organizations throughout the world. He is the author of more than 30 books and more than 100 articles on leadership and organizational effectiveness.

Tom Schimmer is an author and a speaker with expertise in assessment, grading, leadership, and behavioral support. He is a former district-level leader, school administrator, and teacher.

With over 30 years of experience in K–12 education, author and education expert Jeanne Spiller is an associate with Solution Tree, supporting schools and districts through workshops, coaching, and collaborative initiatives to enhance instruction, foster innovation, and promote equity.

Eric Twadell, PhD, is superintendent of Adlai E. Stevenson High School in Lincolnshire, Illinois. He has been a social studies teacher, curriculum director, and assistant superintendent for leadership and organizational development.