Hon’ble Shri Justice Sunil Kumar Sinha was born in a lawyers family at Ambikapur (C.G.) on 07/07/1954. He got school education in Govt. Multipurpose Higher Secondary School, Ambikapur. He took his B.Sc. Degree from Govt. Post Graduate College, Ambikpur in the year 1973 and thereafter also took Masters Degree in Botany from the same Institution, in the year 1975. He did his LL.B. in the year 1980 from Govt. Post Graduate College Ambikapur and was placed in first division. He was enrolled as an advocate in the State Bar Council of M.P. on 03/09/1980. He started his practice in the District and Sessions Court at Ambikapur, under the guidance of his father, Late S.P. Sinha, Advocate, who was an eminent lawyer of Civil, Criminal and Revenue side.
He has worked in all branches in the Trial Court at Ambikapur from 1980 to 1993. Thereafter he shifted to the High Court of M.P. at Jabalpur where he practiced till October 2000. There also he did practice in Civil, Criminal and Constitutional side. Further, he practiced in the State Administrative Tribunal at Jablalpur and handled many cases of different nature.
After re-organization of the state of M.P. he shifted to High Court of Chhattisgarh at Bilaspur in the month of November 2000. There he practiced in various branches of law. He was appointed as Additional Advocate General of Chhattisgarh in May 2003, which post he held till, February 2004. He thereafter started private practice till his elevation as permanent Judge of the High Court of Chhattisgarh on 1st December, 2004.
Hon’ble Shri Justice Sunil Kumar Sinha was transferred to the High Court of Sikkim, where he assumed charge of the office of the Hon’ble Judge of the High Court of Sikkim on 14th July 2014. He assumed charge of the Office of the Chief Justice, High Court of Sikkim as the Acting Chief Justice w.e.f. 08.10.2014. His Lordship, thereafter, assumed the charge of the Office of the Hon’ble Chief Justice, High Court of Sikkim on 30.03.2015.