The Power of Your Subconscious Mind: One of the Most Powerful Self-help Guides Ever Written! (Revised) About the Author Dr. Joseph Murphy was a world-renowned authority on mysticism and mind dynamics. The author of more than thirty books including Secrets of the I Ching, he remains a beacon of enlightenment and inspiration for legions of loyal followers. Ian McMahan, Ph.D., has spent many years as a lecturer, teacher and researcher in the field of motivation. His many books include Get it Done!: A Guide to Maintain Motivation, Determination and Achievement and Secrets of the Pharaohs.