Introduction to the Tantra Śāstra by Sir John George Woodroffe An Introduction to Tanthra Shastra, by Sir. John Woodroffe (1865–1936). This book is intended as a guide for beginners of practical Tantra, and those who are interested in Tantric field. He was a master in Tantra and a Tantric teacher also. Sir. John Woodroffes works on tantra like Serpent power, Shakthi, shaktha, Garland of letters are also popular classics on Hinduism that have shaped the common perception of Hinduism in the West.