Kumar was born on 20 January 1957 in Nalanda district. He is a holder of MBBS degree and was practising as a doctor before joining politics in 1995. He is married to Sangita Devi. He won his first legislative assembly election in the year 2005.[6] Kumar has also ventured into filmmaking and has produced three Bhojpuri movies himself. He got into filmmaking in 2006.[7]
Kumar belongs to OBCKoeri community and is elected from a Koeri dominated constituency of Nalanda district, Biharsharif.[8]
In his term as legislator, he was known for his vigilance and in 2022, he raised voice on misappropriation of fund under Biharsharif smart city project. A total of 72 crore was spent by urban local authorities on the redevelopment of three ponds, the money was about to be allocated for the development of urban infrastructure. Kumar hence pointed out towards unscrupulous activities being carried out in the name of smart city project.[9]