Deborah Loewenberg Ball is the William H. Payne Collegiate Professor in education at the University of Michigan, and an Arthur F. Thurnau Professor. She currently serves as dean of the School of Education and as director of TeachingWorks. She taught elementary school for more than fifteen years, and continues to teach mathematics to elementary students every summer. Ball’s research focuses on the practice of mathematics instruction, and on the improvement of teacher training and development. She is an expert on teacher education, with a particular interest in how professional training and experience combine to equip beginning teachers with the skills and knowledge needed for responsible practice. Ball has authored or co-authored over 150 publications and has lectured and made numerous major presentations around the world. Her research has been recognized with several awards and honors, and she has served on several national and international commissions and panels focused on policy initiatives and the improvement of education. Ball has been elected to the American Academy of Arts and Sciences and the National Academy of Education, and is a fellow of the American Mathematics Society and the American Educational Research Association.