Ken Wilber's first book, The Spectrum of Con-sciousness, written when he was only twenty-three, was hailed as "the most sensible, comprehensive book about consciousness since William James. He is the author of more than a dozen books, including Grace and Grit; Sex, Ecology, Spirituality; A Brief History of Everything; and The Eye of Spirit; and his large readership has kept all of his books in print. He lives in Boulder, Colorado.
