Chief Justice of the Gauhati High Court Justice Adarsh Kumar Goel administered the oath of office and secrecy to Kumar in the presence of Chief Minister Neiphiu Rio and his cabinet colleagues.
Kumar succeeded Nikhil Kumar who has been appointed as the Governor of Kerala to complete remaining of his gubernatorial assignment.
Kumar, 62, who has worked in various positions in CBI and elite SPG, hails from Nahan, a small hill town, in Himachal Pradesh.
He did his Ph.D in management and has a master's degree in business administration with specialisation in human resources management.
An IPS officer of Himachal Pradesh Cadre, Kumar has also served in the elite Special Protection Group dealing with security of the Prime Minister of India.