Dr. Timothy D. Kanold is an award-winning international educator, author, and consultant. He is a former superintendent and director of mathematics and science at Adlai E. Stevenson High School District 125 in Lincolnshire, Illinois. He is a past president of the National Council of Supervisors of Mathematics (NCSM) and the Council for the Presidential Awardees of Mathematics (CPAM). He has served on several writing and leadership commissions for NCTM. He presents motivational professional development seminars with a focus on developing professional learning communities (PLCs) to improve the teaching, assessing, and learning of students. Author of GO Math!, Dr. Kanold provided the program’s pedagogy and scope and sequence. He has also authored nationally recognized articles, books, and textbooks for mathematics education and school leadership, including What Every Principal Needs to Know about the Teaching and Learning of Mathematics.