A.C. Bhaktivedanta Swami Prabhupada's spiritual master, Srila Bhaktisiddhanta Sarasvati Thakur, was the leading proponent of Krishna consciousness in India during the early part of the twentieth century. He specifically taught the philosophy of Chaitanya Mahaprabhu, the divine avatar who revived Krishna-bhakti all over India in the 1500s. When Srila Bhaktisiddhanta first met the young man later known as Srila Prabhupada - in Calcutta in 1922 - he urged him to preach Chaitanya Mahaprabhu's message of Krishna consciousness throughout the English-speaking world. He also told him, "If you ever get money, print books."Srila Prabhupada's most significant contribution, however, is his books. Highly respected by the academic community for their authoritativeness, depth and clarity, they are used as standard textbooks in numerous universities. His writings have been translated into more than eighty languages. The Bhaktivedanta Book Trust, established in 1972 exclusively to publish the works of His Divine Grace, has thus become the world's largest publisher of books in the field of Indian religion and philosophy.With the help of his students, he founded the International Society for Krishna Consciousness (ISKCON). ISKCON is popularly known as the "Hare Krishna" movement.