Mr Sinha was in May 2015 named as cabinet secretary for a fixed two-year term. He took over the new assignment from June 13. Before his appointment as cabinet secretary, he was serving as power secretary.
Mr Sinha, a 1977-batch IAS officer of the Uttar Pradesh cadre, had succeeded Ajit Seth who held the position for four years.
He has earlier served as the shipping secretary and has also held several other important positions in the Union government and in his cadre state - Uttar Pradesh. The Cabinet Secretariat is under the direct charge of the Prime Minister.
The Cabinet Secretariat assists in decision-making in government by ensuring inter-ministerial coordination, ironing out differences among ministries or departments and evolving consensus through the instrumentality of the standing or adhoc committees of secretaries.