Ramakrishna was a Bengali mystic who had a huge impact on the development of modern Hinduism. His chief disciple, Swami Vivekananda, not only helped revive Hinduism in India, but also introduced Hinduism to the West. Ramakrishna was a non-dualist worshippper of the Goddess Kali. However, he also experimented with Christianity and Islam, and repeatedly preached the diversity of paths to God. This is the story of Ramakrishna told first-hand as a series of days and nights spent with his disciples and lay followers. --Sacred Texts

Swami Abhedananda (2 October 1866 - 8 September 1939), born Kaliprasad Chandra was a direct disciple of the 19th century mystic Ramakrishna Paramahansa and the founder of Ramakrishna Vedanta Math. Swami Vivekananda sent him to the West to head the Vedanta Society, New York in 1897, and spread the message of Vedanta, a theme on which he authored several books through his life, and subsequently founded the Ramakrishna Vedanta Math, in Calcutta (now Kolkata) and Darjeeling. -wikipedia