Diwakar oversees ADB's assistance to private sector projects with a clear development impact but limited access to capital. Gupta was Managing Director and Chief Financial Officer of the State Bank of India, where he was responsible for setting strategies and direction alongside other members of the State Bank’s Central Management Committee. He joined the State Bank of India in 1974 and held several positions at its various units and subsidiaries. 

He has also worked as Independent Director on the boards of various business councils, financial services companies and other private organizations in India.