The governor of the Reserve Bank of India is the chief executive officer of India's central bank and the ex-officio chair of its Central Board of Directors. Indian Rupee currency notes, issued by the Reserve Bank of India, bear the governor's signature. Since its establishment in 1935 by the government of India, the RBI has been headed by twenty-five governors. The governor of the Reserve Bank of India is a member of the Strategic Policy Group headed by National Security Advisor Ajit Doval. It is a crucial wing of the National Security Council.