His Holiness B.V. Puri Maharaj
We can know him that he is great only by preaching. Less than 10 years. There is no history, no recording anywhere. Preaching in 10 years he has established this divine name everywhere. As is told in Mahaprabhu's future [prediction].
Reference: His Holiness B.V. Puri Maharaj, ITV, Memories of Srila Prabhupada