Daniel J. Siegel, MD, received his medical degree from Harvard University and completed his postgraduate medical education at UCLA, where he is currently a clinical professor. He is the executive director of the Mindsight Institute, and the author of numerous books, including the acclaimed bestsellers *Mindsight: change your brain and your life* and *The Whole-Brain Child* (co-authored with Tina Payne Bryson). He lives in Los Angeles with his wife and occasionally with his launched adolescents. Mary Hartzell, MEd, received her master's degree in early-childhood education and psychology from UCLA, and is a child-development specialist and parent educator. She has taught children, parents, and teachers for more than 30 years, and has been the director of a highly respected Reggio-inspired preschool in Santa Monica, California. Her parent-education classes and CD series on parent - child relationships have improved the lives of children and their families for decades.