He is son of Lt. Ramruchi Singh and has done LLB from Harish Chander College in Varanasi in the year 1973.

He is a socialist class of politician and has been a founder member of RJD, the Bihar based political party.

Singh had remained minister in all of the Lalu Prasad's cabinets and had defeated Lal Muni Chaubey of Bharatiya Janata Party successfully from the Buxar constituency in 2009.

Singh had even campaigned against his own son Sudhakar in 2010, ensuring his defeat against the Rashtriya Janata Dal candidate.

In November 2019, taking everyone by surprise, RJD appointed Singh as its Bihar state president.