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A name board is pictured at the entrance of Bombay House, headquarters of Tata Group, in Mumbai, India October 27, 2016. The Group's problems started with the ouster of Cyrus Mistry, chairman of holding company Tata Sons on Monday and the exit of N S Rajan, Group HR Head on Friday.Reuters file

In a week of swift development in the Tata Group marked by allegations and counter allegations unknown to the $125 billion (market capitalisation as of October 6, 2016) conglomerate, the Tata Group's human resources head N S Rajan quit on Friday.

The move comes after the removal of Tata Sons chairman Cyrus Mistry on Monday that triggered a public spat between the two sides (Cyrus Mistry and Tata Sons) in a Group that is largely reticent.

Rajan quit the Tata Group on Friday, PTI reported, citing sources.

Rajan's profile says he was appointed by Tata Sons as a member of the Group Executive Council and Group Chief Human Resources Officer reporting to the Chairman, Cyrus P Mistry, with effect from May 9, 2013.

He was working with consultancy firm E&Y in 2001 as Indian people and organisation (P&O) practice leader before moving to Tata Group in 2013.

An alumnus of Loyola College, Chennai, and XLRI, Jamshedpur, Rajan is currently pursuing doctoral studies with IIT Delhi, reads his Linkedin profile.