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Guru Dev was the guru of Maharishi Mahesh Yogi, the founder of Transcendental Meditation. Guru Dev, also known as Swami Brahmanand Saraswati, was a renowned Indian yogi and spiritual leader. He initiated Maharishi Mahesh Yogi into the practice of yoga and meditation, guiding him on his spiritual path. Guru Dev's teachings emphasized the importance of self-realization and the attainment of enlightenment through meditation and spiritual practices.