Hailing from Muzaffarpur (Bihar), Prof. Sinha had a PG Degree in English and Ph.D. in Linguistics from Poona University (1967) studying the grammar of Lepcha language of Sikkim in relation to Bengali, Santhali, Hindi and Vajjika. He retired as Professor of English from RDS College, Muzaffarpur under Bihar University.
Right from his school days in the 1950’s he was involved with the democratic movements of students and suffered fracture and other injuries when police lathi charged agitating students in Patna. He played a leading role in agitation for a judicial enquiry into the police firing on the students of Patna university and later on represented the students in the judicial enquiry headed by the Chief Justice of Patna High court .
Actively involved with the Teacher’s Movement, he was the Convener of Teachers’ Action Committee against the then Congress government which protested police firing in RDS College, Muzaffarpur on 10.12.1966 leading to death of one lecturer and one student and injuries to many others. In a novel manner, he raised funds from the people to represent the case before the judicial Commission which eventually declared the police firing as unjustified. Subsequently he became the Convener of `Teachers’ Action Committee for the defeat of the Congress Party’ during the 1967 state elections. The campaign with the slogan `CONGRESS HARAO’ (defeat the congress) led to the electoral defeat of the Congress party and the formation of the `United Front’ government for the first time in Bihar.
Actively participating in the JP Led 1974 Bihar Movement against the corrupt Bihar Government he was detained under MISA in July 1974 .Detention order was quashed after a few months but he was placed under suspension by the university. When the Emergency was clamped in June 1975 Prof. Sinha joined the movement against the Emergency. Subsequently, he went underground when a warrant for arrest was issued which led to the promulgation of an order for attachment of property was issued. He was subsequently arrested under the Defence of India Act. After a few months in jail, in an unprecedented judgement he was granted bail by a very bold and unconventional judge. The judgment was broadcast by BBC. Following his release from the jail he was once again placed under suspension which was withdrawn only after the emergency was lifted. During this period he remained active in anti-emergency activities succeesfully evading further arrest. During the emergency, Prof. Sinha regularly kept meeting J.P, who lived in Patna after release from jail.
During the Lok Sabha elections in 1977 Prof. Sinha worked as election in charge of Muzaffarpur Assembly segment for George Fernandes, who was in jail in Delhi. George Fernandes won the election.
Though part of the anti Emergency movement, refrained from joining the Janta Party , as joining a party without compromising principles was not possible. Refrained from taking up any position under the government for the same reason.
Prof. Sinha was elected Vice President, Bihar PUCL in March, 1981, became Acting President in October, 1983 on account of the illness of the then President, PUCL Bihar. He was elected as President in 1986, re-elected in 1988 and was President of Bihar PUCL early 1986 to late 1991.
At the national level, Prof. Sinha was elected as a National Organising Secretary in 1988 at Jaipur and as Vice President at Poona in 1990. He assumed charge as President of National PUCL in Ranchi (2009) and was re-elected as President for 2012-14 and 2014-16 terms.