Belongs to 1975 batch of IPS (Manipur / Tripura Cadre).Served in Ministry of Home Affairs and Cabinet Secretariat for approximately 30 years and retired as Secretary in the Prime Minister’s Office in the year 2012. He also served in United Nations as Head of the UN Mission in North Kosov (2012-2014). Currently he is a Member of the National Security Advisory Board.During the span of almost 45 years, Shri Mathur has been closely involved in national security issues both at operational and policy level. He has been involved in political analysis and negotiation, conflict resolution, security sector development and strategic communication in bilateral and multilateral settings. His work also included knowledge of international dimensions of terrorism, ethnic/ caste violence and its ramifications.Shri Mathur has served in Indian Embassies in Belgium and Pakistan. During his assignments as Secretary to the Govt. of India, his special area of interest had been study of issues affecting national security in India’s neighborhood including Bangladesh, Nepal, Pakistan, Sri Lanka, Myanmar, Maldives etc. with a view to providing inputs for shaping a coherent Indian security strategy towards these countries.His other area of interest has been North East of India where he was successful in bringing peace in some regions through political reconciliation and integration of militants / insurgents in the national mainstream. He continues to remain involved in a similar exercise.Shri Mathur has been awarded medals by the President and the Prime Minister of India besides various other awards and commendations including the current NSA.Shri Mathur holds Master’s degrees in Physics and History with knowledge of basic French.