Michelle Stephan, EdD, is an associate professor of mathematics education with a joint appointment in the College of Education and Department of Mathematics and Statistics at the University of North Carolina at Charlotte. She earned bachelor's and master's degrees in pure mathematics and in 1998 earned an EdD in mathematics education from Peabody College of Education at Vanderbilt University. After working as an associate professor at Purdue University Calumet, she left academia for the classroom, where she taught middle school mathematics for seven years in Florida. It was there that she began to explore the ideas of lesson imaging with her middle school teaching colleagues George McManus, Jennifer Smith, and Ashley Dickey. In 2012, Stephan became faculty at the University of North Carolina at Charlotte and began a collaboration with coauthors David Pugalee, Julie Cline, and Chris Cline. Together they have presented on lesson imaging at numerous conferences and provided professional development for several North Carolina school districts. Stephan has published a dozen book chapters and more than 25 journal articles, and she has made more than 50 presentations both nationally and internationally.

David Pugalee, PhD, is a professor of education at the University of North Carolina at Charlotte, where he serves as director of the Center for Science, Technology, Engineering, and Mathematics Education. He earned his PhD in mathematics education from the University of North Carolina at Chapel Hill and has also taught at the elementary, middle, and secondary levels.

With more than a decade of experience teaching mathematics and science, he has published research articles in American Educational Research Journal, Educational Studies in Mathematics, and School Science and Mathematics. His works include several books and book chapters published by the National Council of Teachers of Mathematics. 

Julie Cline earned a bachelor’s degree in education from Wingate University in North Carolina. She has taught middle school mathematics for 22 years and recently earned National Board Certification in Mathematics/Early Adolescence.

After being introduced to Michelle Stephan, Cline began exploring lesson imaging in her practice. As the leader of her professional learning community, Cline encouraged other teachers to join her in using lesson imaging. She has provided professional development in her district as well as presented at several conferences. Cline continues to support teachers at her school in her current role as math facilitator.

Chris Cline is a graduate of the University of North Carolina at Charlotte, and holds a Bachelor of Arts degree in mathematics and a master's degree in mathematics education. He is also a National Board–Certified Teacher in Mathematics/Early Adolescence.

Cline has taught 7th and 8th grade mathematics for 21 years. Three years ago, he incorporated lesson imaging into his practice and since has provided professional development in his district and has presented at several conferences. Cline has served as math facilitator at his school and has supported and coached colleagues.