Peter Gray is a research professor of psychology and neuroscience at Boston College who has conducted and published research in neuroendocrinology, developmental psychology, anthropology, and education. He is author of an internationally acclaimed introductory psychology textbook (Psychology, Worth Publishers, now in its 8 th edition), which views all of psychology from an evolutionary perspective. His recent research focuses on the role of play in human evolution and how children educate themselves through play and exploration, when they are free to do so. He has expanded on these ideas in his book, Free to Learn: Why Unleashing the Instinct to Play Will Make Our Children Happier, More Self-Reliant, and Better Students for Life (Basic Books). He also authors a regular blog called Freedom to Learn, for Psychology Today magazine. He is one of the founders of the nonprofit Alliance for Self-Directed Education and of the nonprofit Let Grow , the mission of which is to renew children’s freedom to play and explore independently of adult control. You can follow him on Facebook.