His Holiness Narayana Maharaj
He (Srila Prabhupada) had done something that Vivekananda and other persons could not do in over long period. But in a very short time, he had done marvelous. Others have gone to the Western countries, but they could not do what Swami Maharaj (Srila Prabhupada) has done, very valuable service to his spiritual master.
Reference: Prabhupada at Radha Damodara Book