JACK KORNFIELD was trained as a Buddhist monk in Thailand, Burma, and India and has taught around the world since 1974. He also holds a doctorate in clinical psychology. A co-founder of the Insight Meditation Society and of the Sprit Rock Meditation Center, he lives in Northern California with his wife and daughter.
Spirit Rock is dedicated to the teachings of the Buddha as presented in the Vipassana tradition. The practice of mindful awareness, called insight or Vipassana meditation, is at the heart of all the activities at Spirit Rock. The center hosts a full program of ongoing classes, daylong retreats, and residential retreats.

Jack Kornfield in The Translucent Revolution:

“People have such a tendency to repress or to be frightened of emotions, because people don't understand that they are empty. There's actually no problem with emotions. The only problem is the fear of them or the identification with them, they are not who we really are.  I try to teach in such a way that people understand the play of emotion in the same way that they understand the play of fire."

Spirit Rock Website