Yoga. Humanistic Psychology. Meditation. Holistic Healing. These practices are commonplace today. Yet before the early 1960s they were atypical options for most people outside of the upper class or small groups of educated spiritual seekers. Esalen Institute, a retreat for spiritual and personal growth in Big Sur, California, played a pioneering role in popularizing quests for self-transformation and personalized spirituality. This “soul rush” spread quickly throughout the...