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Michael A. Singer
Michael Alan "Mickey" Singer is an American author, journalist, motivational speaker, and former software developer. Singer is best known for his writings on spirituality, meditation, and New Age philosophy, and three of his books on the subject, The Untethered Soul (2007), The Surrender Experiment (2015), and Living Untethered (2022), were New York Times bestsellers. Singer established the Temple of the Universe, a yoga and meditation center in Alachua, Florida, in 1975.
Excerpt from Wikipedia, available under CC BY-SA 4.0.
Books

The Untethered Soul Guided Journal Practices to Journey Beyond Yourself
2020
ISBN 9781684036561
Living untethered
2022
ISBN 9781648480935