Sathya Sai Baba is the reincarnation of Shirdi Sai Baba and there is a third incarnation yet to appear who will be Prema Sai Baba. They are sort of a Trinity of Holy Men
Sai Baba has done wonderful things for the poor and downtrodden in India. He performs miracles, but he doesn't seem to care much for publicity or fame.
A physician friend of mine went to India and stayed three weeks in the Sai Baba's compound and finally had a short audience with him. He told me that the beauty and the love that radiates from Sai Baba is outside of anything he has ever experienced before. I believe the Sai Baba's mission is to minister in India to the very needy and that is all he concerns himself with. He has built a modern hospital and new schools, all of which are free. You can get more information here:
Introduction to Sathya Sai Baba
Introduction to Sathya Sai Baba