His Divine Grace A.C. Bhaktivedanta Swami Prabhupada (1896-1977) is widely regarded as the foremost Vedic scholar, translator, and teacher of the modern era. He is especially respected as the world's most prominent contemporary authority on bhakti-yoga, devotional service to the Supreme Person, Krishna, as taught by the ancient Vedic writings of India. He is also the founder-acharya of the International Society for Krishna Consciousness. Srila Prabhupada, as he's known to his followers, translated and commented on over eighty volumes of the Vedas' most important sacred bhakti texts, including the Bhagavad-gita—a concise handbook for understanding the purpose and goal of human life—and the multi-volume Srimad-Bhagavatam—an epic biography of Krishna, Krishna's avatars, and His many devotees throughout the history of the universe. Srila Prabhupada's own 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.