Current Position
- Secretary to the Government of India, Department of Atomic Energy (DAE)
- Chairman, Atomic Energy Commission of India
He assumed charge around April/May 2023 (succeeding K.N. Vyas). Original tenure was up to age 66 (10 October 2025) or until further orders. He later received extensions, including a six-month extension and a further one-year extension effective from 11 April 2026 (in relaxation of Fundamental Rule 56(d)).
- Chairman, Atomic Energy Commission of India
He assumed charge around April/May 2023 (succeeding K.N. Vyas). Original tenure was up to age 66 (10 October 2025) or until further orders. He later received extensions, including a six-month extension and a further one-year extension effective from 11 April 2026 (in relaxation of Fundamental Rule 56(d)).
Positions Held in the Past
- Director, Bhabha Atomic Research Centre (BARC) — 13th Director, from 12 March 2019 until approximately September 2023.
- Director, Saha Institute of Nuclear Physics.
- Director, Physics Group, BARC.
- Spokesperson, India-CMS collaboration.
- General Secretary and later President, Indian Physics Association (IPA).
- CERN Scientific Associate (twice): 2002–2004 and 2010–2011.