Swami Sri Yukteswar Giri is the monastic name of Priya Nath Karar, an Indian monk and yogi, and the guru of Paramahansa Yogananda and Swami Satyananda Giri. Born in Serampore, West Bengal, Sri Yukteswar was a Kriya yogi, a Jyotishi, a scholar of the Bhagavad Gita and the Upanishads, an educator, author, and astronomer. He was a disciple of Lahiri Mahasaya of Varanasi and a member of the Giri branch of the Swami order. As a guru, he had two ashrams, one in Serampore and another in Puri, Odisha, between which he alternated his residence throughout the year as he trained disciples.

Paramahansa Yogananda was an Indian-American Hindu monk, yogi and guru who introduced millions to meditation and Kriya Yoga through his organization, Self-Realization Fellowship (SRF) / Yogoda Satsanga Society (YSS) of India – the only one he created to disseminate his teachings. A chief disciple of the yoga guru Swami Sri Yukteswar Giri, he was sent by his lineage to spread the teachings of yoga to the West. He immigrated to the US at the age of 27 to prove the unity between Eastern and Western religions and to preach a balance between Western material growth and Indian spirituality. His long-standing influence in the American yoga movement, and especially the yoga culture of Los Angeles, led him to be considered by yoga experts as the "Father of Yoga in the West". He lived his last 32 years in the US.