Michael D. Steele is a Professor and Chairperson of the Department of Educational Studies in Teachers College at Ball State University. He is a Past President of the Association of Mathematics Teacher Educators, current director-at-large of the National Council of Teachers of Mathematics, and editor of the journal Mathematics Teacher Educator. A former middle and high school mathematics and science teacher, Dr. Steele has worked with preservice secondary mathematics teachers, practicing teachers, administrators, and doctoral students across the country for the past two decades. He has published several books and journal articles focused on developing mathematics teacher knowledge and supporting teachers in enacting research-based effective mathematics teaching practices. He is the co-author of NCTM’s Taking Action: Implementing Effective Mathematics Teaching Practices in Grades 6-8, The 5 Practices in Practice: Successfully Orchestrating Mathematics Discussions in Your High School Classroom, and several other research-based professional development resources for secondary mathematics teachers. He is also the author of A Quiet Revolution: One District’s Story of Radical Curricular Change in Mathematics, a resource focused on reforming high school mathematics teaching and learning.