M K Narayanan
He was appointed to this post on January 25, 2005, three weeks after the former NSA, J N Dixit died on January 3, 2005. He resigned on 30 November 2008 over the attacks in Mumbai that killed nearly 200 people.
He has been heavily criticized in leading up to the Mumbai terrorists attacks of his preoccupation with Sri Lanka and the LTTE, instead of India's chief threat Kashmir insurgents and Pakistan. The Prime Minister accepted his resignation.
Narayanan headed the Intelligence Bureau (IB) from 1987 to 1990, before heading the Joint Intelligence Committee.