A simple yet comprehensive guide to the types of psychologies and therapies available from Eastern and Western sources. Each chapter includes a specific exercise designed to help the reader understand the nature and practice of the specific therapies. Wilber presents an easy-to-use map of human consciousness against which the various therapies are introduced and explained. This edition includes a new preface.

"Ken Wilber is one of the most important pioneers in the field of consciousness in this century."—Deepak Chopra

"The most sensible, comprehensive book on consciousness since William James."—Dr. James Fadiman, President, Association for Transpersonal Psychology

"No Boundary does for this generation what Alan Watts' writings did for an earlier one. It brings the most difficult subject of all—nature of consciousness—into an easily grasped presentation that is both elegant and simple." —John White, editor of  Kundalini, Evolution, and Enlightenment 

Ken Wilber is the author of over twenty books. He is the founder of Integral Institute, a think-tank for studying integral theory and practice, with outreach through local and online communities such as Integral Education Network, Integral Training, and Integral Spiritual Center.