Roy will formally take charge of the top post on Tuesday morning as Harinder Hira retires today .
Roy is a 1978 batch IAS officer . He has been DM for long spells in Hamirpur and Kangra districts in the 1980s .
He has also served in the union ministry of commerce and industry , environment and forests , urban development and the textiles ministries .
Roy has also been principal secretary forests in Himachal . A year ago he took over as the additional chief secretary .
He still has more than a couple of years to retire .