John Campbell, PhD, is an independent scholar, accomplished yogin, and translator of Sanskrit and Tibetan texts. His main areas of research are practice systems of yoga and tantra in Indo-Tibetan Buddhism and Hinduism. He is currently writing a book on the commentarial literature of Buddhist and Hindu tantric Buddhist practice systems in late first-millennium India. A former assistant professor of Buddhist studies at the University of Virginia, Charlottesville, among other academic institutions, he teaches graduate and undergraduate courses in the theory and practice of yoga (both contemporary and premodern), Buddhist philosophy in India and Tibet, and surveys of culture and religion in South, East, and Himalayan Asia. He is currently the director of Sanskrit projects for the Asian Classics Input Project, developing the digitization of classical Sanskrit texts on Buddhist and Hindu spiritual sciences. He also advises the research of advanced graduate students in UVA’s renowned Buddhist Studies doctoral program.