[1] Previously he served in the same post from December 2023 until was removed by Election Commission of India in March 2024.

Prior to his office, he is also additional chief secretary of Information Technology of West Bengal Government since 2023.

[5][6] He was the Additional Director of Criminal Investigation Department, West Bengal from 20 February 2019 until December 2019.

[7] He was promoted to Director General of Police, West Bengal on 27 December 2023 on the superannuation of Manoj Malaviya batch of 1988 IPS.

In 2019, Kumar was accused by the CBI in the Supreme Court of tampering with electronic evidence related to the Saradha chit-fund case.