As the Deputy Commissioner of Police/South, Neeraj Kumar is remembered as a people friendly DCP, who cracked the serial crimes committed by members of an erstwhile criminal tribe in which citizens were being bludgeoned to death in their sleep and thereafter looted.
As the DCP/Crime he cracked the massive multi crore racket in state run lotteries in 1992. As part of the Central Bureau of Investigation, under his leadership the Special Task Force cracked the serial train blast cases of 1994.
His tenure in the CBI is also highlighted by the solving of the Meenakshi Amman Temple, the unearthing of the UTI Scam, the arrest and deportation of American Centre attack mastermind Aftab Ansari from Dubai, the arrest of Abdul Lateef, a notorious underworld don of Gujarat; Romesh Sharma, a Dawood Ibrahim henchman masquerading as a politician based in Delhi; and the cracking of the Cricket match fixing scandal. Jagtar Singh Tara, the first accused to be nabbed in the assassination of the then Punjab CM Sardar Beant Singh, was arrested by him, which led to the unravelling of the entire conspiracy.
Neeraj Kumar has undertaken various foreign assignments and training session as part of the Delhi Police. He went to Tokyo (Japan) for three weeks in 1985 for a training programme on Traffic Police Management and attended a course on Post Blast Investigations organized by the Federal Bureau of Investigation FBI at Baton Rouge, Louisiana in 1997. He represented India at the UN Convention on Trans-national Organized Crime in Vienna, Austria. He also represented India at Vienna during deliberations of United Nations Manual on Kidnapping & Extortion, 2014. He was handpicked to be the Conference Secretary when the World Interpol Conference took place in New Delhi in October 2007.
He has visited U.S.A., U.K, Germany, Australia, Israel, France, Japan, U.A.E, and various other countries for conferences, investigations and training programmes. In February, 2012 he was invited by the U.K. Government to share his experiences of organizing the security arrangements during Commonwealth Games 2010 for the benefit of the U.K. Police. He was decorated with the President’s Police Medal in 1992 and President’s Police Medal for Distinguished Service in 1999 and has also been felicitated by the Luton Cricket Club, United Kingdom for “making cricket a better arena to play in” in 2013.