| Journey | - He started his career as a sub-divisional police officer (SDPO) and got his formative posting as the Additional Superintendent of Police (ASP) of Chandrapur.
- He was the DCP of Thane (Mumbai) and also served as the DCP of the Mumbai Crime Branch.
- While serving as the DCP of Mumbai's Crime Branch in the early 90s, he headed an encounter specialist team of Mumbai Police that was created to counter the rising gangsterism in Mumbai.
- While he was the Additional Commissioner of Maharashtra's Anti-terrorism Squad (ATS), the ATS arrested Pragya Thakur (now a member of BJP) and Lt Col Prasad Shrikant Purohit in the 2008 Malegaon blasts case.
- Under his supervision, ATS nabbed the former zonal director of Narcotics Control Bureau (NCB) Saji Mohan (ex-IPS) with 39 Kgs of heroin. In 2019, Saji Mohan was sentenced to 15 years of jail term under the NDPS Act.
- In 2017, when he was Thane Police Commissioner, a local crime branch team of Thane, headed by encounter specialist Pradeep Sharma, arrested India's most wanted fugitive gangster Dawood Ibrahim's brother Iqbal Kaskar under extortion charges.
- In February 2019, he was posted as the DGP of the Anti-Corruption Bureau (ACB). During his stint as the DGP of ACB, he gave a clean chit to Nationalist Congress Party's leader Ajit Pawar in the Vidarbha irrigation scam case.
- In February 2020, he was appointed as the Commissioner of Mumbai Police. Some of the significant cases that were probed by the Mumbai Police when Param Bir Singh was its head include Bollywood actor Sushant Singh Rajput's suicide case, TRP manipulation scam that accused some big news channels of fraudulently increasing their viewership, and previously closed abetment to suicide case of Anvay Naik in which Republic TV's head Arnab Goswami was arrested.
- In March 2021, he was shunted out as Police Commissioner of Mumbai to Commandant General of Home Guards (Maharashtra) for administrative exigencies.
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