About The Authors

Bill Barnes is the superintendent of the Howard County Public School System in Maryland. He has served in leadership roles with the Maryland and National Council of Teachers of Mathematics, and has won a number of state and national teaching awards.

Barnes holds a master of science in mathematics and science education from Johns Hopkins University, and has served as an adjunct professor for Johns Hopkins University, the University of Maryland–Baltimore County, McDaniel College, and Towson University.

 

Dr. Erin Lehmann is an associate professor for the University of South Dakota. She has experience as an elementary principal at a Title I school, as well as being a math teacher, math coach, and curriculum specialist.

Dr. Lehmann is the author or co-author of several books, including Teaching Mathematics Today. She is a frequent speaker at national conferences, advocating for mathematics and grading practices. She holds EdD in educational leadership from the University of South Dakota.