Justice Sinha is the grandson of Babu Baldev Sahay, Bihar’s first advocate general, and Dr Raghunath Saran, personal physician to India’s first President Dr. Rajendra Prasad. He is the son of Benoy Sinh who retired as additional secretary in the Ministry of Power, Government of India. He studied law from Delhi University and practiced in the Patna High Court for 23 years on civil, constitutional, labour, service, commercial, company and criminal maters.