Authors & Presenters

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  1. Gwendolyn Zimmermann

    Gwendolyn Zimmermann


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

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  2. Jonathan A. Wray

    Jonathan A. Wray


    Jonathan A. Wray is a mathematics instructional facilitator for the Howard County Public School System in Maryland. He is a former elementary teacher, gifted and talented resource teacher, mathematics supervisor, grant project manager, and consultant.

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  3. Susan Udelhofen

    Susan Udelhofen

    Assessment School Improvement

    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.

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  4. Eric Twadell

    Eric Twadell

    Assessment Competency-Based Learning Leadership Response to Intervention Social and Emotional Learning Teams

    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.

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  5. Mona Toncheff

    Mona Toncheff


    Mona Toncheff, an education consultant and author, worked as both a mathematics teacher and a mathematics specialist for the Phoenix Union High School District in Arizona.

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  6.  Cheryl Zintgraff Tibbals

    Cheryl Zintgraff Tibbals

    Cheryl Tibbals served as a teacher and district leader in California; state director of assessment development in Kentucky; director of the State Leadership Center in Washington, DC; and national consultant and senior advisor to states, districts, and education businesses.

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  7. Janet Lynne Tassell

    Janet Lynne Tassell

    21st Century Skills Curriculum Instruction Technology

    Janet Lynne Tassell, PhD, is an associate professor at Western Kentucky University, where she teaches elementary math methods and directs the Elementary Mathematics Specialist Endorsement program.

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  8. Rebecca Stobaugh

    Rebecca Stobaugh

    21st Century Skills Assessment Curriculum Instruction Technology

    Rebecca Stobaugh, PhD, is an assistant professor at Western Kentucky University. She teaches assessment and unit-planning courses, supervises first-year teachers, and consults with school districts on critical thinking, instructional strategies, assessment, technology integration, and other topics.

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  9. Rebecca L. Stinson

    Rebecca L. Stinson


    Rebecca L. Stinson has over 20 years in education. Her roles include teacher, educational planner, and principal in the Chicago Public School System, where she has worked for the past several years.

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  10. Jeanne Spiller

    Jeanne Spiller

    Assessment Leadership Response to Intervention

    Jeanne Spiller is assistant superintendent for teaching and learning for Kildeer Countryside District 96 in Illinois. Her work focuses on implementation of the Common Core State Standards.

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