He is known for modernizing the Kerala Police, and his work to enhance law enforcement and effectiveness in the state.[6] Before becoming the SPG Director, Sinha served with the Border Security Force, contributing to safeguarding India's borders. In 2016, he assumed the role of Director of the Special Protection Group (SPG),[7] where he was responsible for the security of the Prime Minister of India and former Prime Ministers.[8]
From June 2009 to June 2014, Mr. Sinha served a five-year Central deputation with the Border Security Force (BSF), holding the position of Inspector General (IG) for the Gujarat Frontier.[9] During his tenure, he worked on border security along an 860-kilometer stretch, which included the Barmer region of Rajasthan. His is known for deterrence of illegal activities carried out by counterparts, armed non-state entities (ANEs), and smugglers in the region.
As Director SPG he introduced training programmes to strengthen the acumen of SPG officers to provide fail proof security cover to all its Protectees.[10]
On 30 May 2023 just one day before retirement, he was given an extension for 1 year in the same post.[11]
Sinha is known for launching Kerala Police's first website, a pioneering step in police digitalization. This model was subsequently adopted by other Indian states.[5]
He was experiencing health issues related to pancreatic cancer and was admitted to Medanta hospital in Gurugram for treatment[13] where he died on 6 September 2023.[1] At the time of his death, he was the longest serving Director SPG.[14]