David R Hawkins is a recognized teacher of a way to Enlightenment. His books are a treasure trove of insight. He has authored such books as Power vs. Force: The Hidden Determinants of Human Behavior; Transcending the Levels of Consciousness: Stairway to Enlightenment; Letting Go: The Pathway of Surrender.
Eckhart Tolle, A New Earth: Awakening to Your Life's Purpose.
Gary Zukav, The Seat of the Soul.