Indian nuclear and condensed matter physicist who served as Chairman of the Indian government's Atomic Energy Commission. He was also the Vice-President of the International Union of Crystallography from 1996 to 1999.
He belonged to the team that conducted India's first nuclear test in 1974, and he led the Department of Atomic Energy's later nuclear trials.
He studied physics at Madras University and at the Indian Institute of Science.
He was born in Chennai, Tamil Nadu, India.
He and fellow Indian scientist, Prasanta Mahalanobis, were both recipients of the Padma Vibushan, a prestigious Indian honor.