Anna O. Graeber is Associate Professor Emerita in the Department of Curriculum and Instruction at the University of Maryland, with her doctorate in mathematics education from Teachers College, Columbia University. Prior to teaching at the University of Maryland, she served in various mathematics curriculum and staff development positions at Research for Better Schools, a regional educational laboratory in Philadelphia. She is best known for her research on students' misconceptions in mathematics.

Linda Valli is the inaugural Jeffrey & David Mullan Professor of Teacher Education and Professional Development in the Department of Curriculum and Instruction at the University of Maryland. Her Ph.D. is from the Department of Education Policy Studies at the University of Wisconsin, Madison, where she developed her interests in educational inequalities and critical theory. She has used cases in her own teaching and conducts research on learning to teach, professional development, culturally-responsive teaching, and education policy.

Kristie Jones Newton is assistant professor in the Department of Curriculum, Instruction, and Technology in Education at Temple University whose research and teaching focuses on mathematics education. As a graduate student at the University of Maryland, she participated extensively in the development and conduct of the High-Quality Teaching study, contributed significantly to the selection and writing of the cases, piloted the cases in her undergraduate math methods class, and wrote commentaries for the Facilitator's Guide.