Authors & Presenters

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.

Susan Udelhofen, PhD, has 15 years of experience as a consultant. She provides professional development on some of the most relevant topics in education, including the Common Core, assessment, and school improvement.

Jonathan G. Vander Els specializes in supporting teachers and administrators in schools and districts across the country in developing, sustaining, and enhancing structures to support all learners.

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.

Haley Vogel, EdD, is assistant principal at Pine Island Academy in St. Johns County, Florida. Her more than 20 years of experience in education includes six years as a school leader and 13 years teaching. She is passionate about working with teacher teams to rethink assessment.

Michelle Wambach is an elementary principal in Southern Arizona, where she is a dedicated and visionary educational leader. She has served as a teacher, student achievement teacher, and administrator.

Philip B. Warrick, EdD, is an author and presenter and has worked globally in the areas of school leadership, instruction, collaborative practices, and grading.

Nathan L. Wear is the associate superintendent and chief academic officer of Linn-Mar CSD in Marion, Iowa. He has served as an elementary teacher and as an elementary and high school principal.

Katie White is an author and presenter with more than 30 years of experience in education. She has been a system leader, an administrator, a learning coach, and a K–12 classroom and online teacher.

Shelly Wilfong, PhD, is assistant superintendent of Wawasee Community School Corporation in Syracuse, Indiana. She has been an educational professional for 30 years, with 19 years as a classroom teacher.