Authors & Presenters

Obie Leff has more than 30 years of expertise in education and leadership. He currently serves as director and principal of Twin Rivers Charter School, a 2024 Model PLC at Work® and National Blue Ribbon School.

Erin Lehmann, EdD, currently serves as an assistant professor for the University of South Dakota. She is an author, leader, and facilitator, advocating for mathematics and high levels of learning for all.

Cheyana Leiva is a transformational leader who understands the challenges schools are facing and the strategies necessary to improve. As a principal, she led her high-poverty school to an A rating in three years.

Cheryl Lemke, an author and a consultant, specializes in public policy for K–12 learning technology, working at a variety of levels with governors, legislators, superintendents, business leaders, and teachers.

Jennifer A. Lenhardt, MEd, is a senior manager for professional services with Houghton Mifflin Harcourt, where she integrates her experience as a teacher and her research interest into equity and culturally responsive teaching with the professional learning she creates.

David A. Levine is a teacher, trainer, facilitator, author, and musician who has made an indelible impact on students, teachers, and parents throughout the United States and abroad since 1984.

Allison Lewallen, EdM, principal of Morris Middle School in Houston, Texas, has worked in education for more than 15 years as a teacher, instructional specialist, and assistant principal. As principal, her school was named a Model Professional Learning Community at Work® campus.

Pamela Liebenberg, EdD, has been an educator for more than 25 years. She has served as an award-winning teacher, assistant principal, principal, regional director, and district director supervising 35 schools in the Tuscaloosa County School System.

Dana Lillis serves as the director of teaching and learning for Carlisle Community Schools in Carlisle, Iowa. Dana’s passion is developing agency in teacher leaders and administrators to ensure they have the knowledge, skills, and tools to lead and support the PLC process.

Doug Lillydahl is director of communication arts at Adlai E. Stevenson High School in Illinois. He guides literacy interventions and staff development, oversees ELA assessment, and supports curricular and instructional evolution.