Tata Group Chairman Ratan Tata is retiring today at the age of 75. He transformed the Tata group from a conventional corporate house into a 100 billion dollar global conglomerate with high-profile acquisitions abroad. He will hand over the reins of the group to 44-year old Cyrus Mistry, who was chosen his successor last year and formally appointed Chairman earlier this month. Mr Ratan Tata is hanging up his boots after steering the group for 21 years as its Chairman.His vision to transform the group into a multinational giant resulted in high profile acquisitions such as Tata Tea's takeover of UK brand Tetley for 450 million dollars in 2000. But Ratan Tata set new standards for the Indian corporates in the current era of globalisation when Tata Steel acquired Anglo-Dutch Corus for 6.2 billion pounds beating CSN of Brazil in 2007. A year later, the group's automotive firm Tata Motors lapped up British luxury vehicle maker Jaguar Land Rover for 2.3 billion dollar from Ford Motor Co.