Who is manager of Reserve Bank of India?

No I don't think that RBI will be having any manager. Its governor is Duvvuri Subbarao, whos 3 year term of office ends in this September. Most probably he will not be called back for second term. We can expect a new one after September. Yet when Duvvuri Subbarao came in as governor the inflation was at very high. He weathered the difficult situation.