The chairperson of the State Bank of India is the chief executive officer of India's largest scheduled commercial bank and the ex-officio chair of its Central Board of Directors. Since its establishment in 1955 by the government of India, the SBI has been headed by twenty-six chairpersons. The inaugural officeholder was the Indian railway minister John Matthai, while Raj Kumar Talwar holds the unique distinction of having been in office for the longest time. P. C. Bhattacharya also held the post of governor of Reserve Bank of India.