A pragmatist with a close knowledge of monetary policies, he, as finance secretary, was the pointperson between the Reserve Bank of India and the government. An IIT-Kanpur alumnus, he topped the civil services exam in 1972 and was assigned the Andhra Pradesh cadre. He is also a MS in Economics from Ohio State University (1978) and a Humphrey Fellow at MIT during 1982-83. Name the person.