Sri Sri Ramakrishna Paramahamsa Avatara Deva was the Founder of the Ramakrishna Universal Yoga System, and inspired the formation of the Ramakrishna Math to perpetuate his teachings following his death. His System has enabled a greater number of yogis to achieve Nirvikalpa Samadhi than any other single yoga organization, both in India and abroad. The following links provide further information regarding Sri Ramakrishna and his teachings for those who are interested.
I enthusiastically suggest downloading the free e-book 'The Gospel of Ramakrishna'. It is must reading for any serious yoga sadhaka, and for practitioners of any school or style of meditation.