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New Delhi : Sanjay Mitra, a 1982 batch IAS officer of West Bengal cadre, took over as the new Defence Secretary on May 24, 2017, succeeding G Mohan Kumar. Mitra is a Post-Graduate in Physics and Economics, according to a PIB release. He also did his Mason Fellowship at the John F Kennedy School of Government, Harvard University, in 1995 – 96. Mitra was earlier Secretary, Ministry of Road Transport & Highways in the Government of India, and had also worked as Chief Secretary of West Bengal.