Authors & Presenters

With over 25 years of experience in education, Annie Griffin has transformed classrooms and schools into positive, collaborative learning spaces. She specializes in the PLC process, rural education, literacy, and creating positive culture in schools.

Suzanne Gruendling is an experienced principal in elementary and middle school education in Vermont. She has a passion for working with guiding coalitions and collaborative teams to find the best path forward.

Mike Hagadone, MEd, served as the assistant superintendent of White River School District in Washington State until his retirement in 2020. With 40 years of experience, he is a former teacher, assistant principal, principal, and director of secondary education.

Valerie Hairston is principal of Specialist Rafael Hernando III Middle School in El Paso, Texas. With 18 years of experience, she led her school to implement the professional learning community process, establish a collaborative culture, and improve student achievement.

Katie Kreimer Hall, EdD, is the supervisor of curriculum and professional development for Fort Smith Public Schools. Previously an administrator in high-poverty schools, she is passionate about building self-efficacy in teachers through the professional learning community process to increase student achievement.

Bill Hall is the former director of educational leadership and professional development for Brevard Public Schools in Florida. He has served as a classroom teacher, assistant principal, and principal.

John Hannigan, EdD, is an author and speaker who has served in education for over 20 years as a teacher, instructional coach, principal, and county office leadership coach. His expertise includes RTI at Work™, PLC at Work®, MTSS, PBIS, restorative practices, social-emotional learning, and more.

Aaron Hansen is a nationally recognized presenter, author and coach who empowers teachers and leaders to transform their schools.

Chris Hansen has been a teacher, principal, and a director of technology and learning in his more than 30 years of education and international experience. Currently, he works as a Solution Tree associate throughout the United States, where his passion is implementing and refining professional learning communities.

Amanda Hathhorn, district math specialist and mentor for the Aspiring Instructional Coaching Academy at Pasadena ISD, has over 20 years of experience in education. Notably, she played a pivotal role in successfully implementing the Professional Learning Communities (PLC) at Work® process and subsequently earning a Model PLC at Work school distinction at V. W. Miller Intermediate.