Keith Davids, PhD, is dean of the School of Physical Education at the University of Otago in New Zealand. He has taught and conducted research in the field of motor learning and control for 25 years. In addition, he has produced three books in this area and authored numerous chapters and articles for journals. Davids has worked in higher education in both Europe and New Zealand. He is currently a co-editor of the International Journal of Sport Psychology and received a PhD in motor control from Leeds University, UK, in 1986. Simon Bennett, PhD, has taught and conducted research in the field of motor control for over 10 years. He is a senior lecturer in Motor Control at Manchester Metropolitan University, UK, where he also serves as research team leader and laboratory director. Bennett received his PhD from Manchester Metropolitan University. A few of Bennett's research interests include specificity of learning, coordination dynamics, information sources for interceptive actions, intermittent vision, ventral and dorsal processing, and observational learning. He has co-authored several chapters and articles for journals in this field. Karl Newell, PhD, is associate dean for research and graduate education in the College of Health and Human Development at Penn State University. He has conducted a long-standing research program on the role of movement variability in motor control and has helped create a new way to think about movement variability. Newell is former editor of the Journal of Motor Behavior and served as president of the North American Society for Psychology of Sport and Physical Activity.