Jack Kornfield, PhD, has been teaching meditation globally since 1974 and was one of the key teachers to introduce mindfulness practices to the West. Co-facilitator of The Mindfulness Meditation Teacher Certification Program, he has led thousands of students in becoming transformative forces for better outcomes and positive social change. He is also the cofounder of the Insight Meditation Society in Barre, Massachusetts, and the Spirit Rock Center in Woodacre, California. His many books have been translated into 22 languages and sold more than 1.5 million copies. He is a grandfather and husband, and holds a PhD in clinical psychology.