Ratan Tata, who led the transformation of the Tata group from a conventional corporate house into a $100 billion global conglomerate with high-profile acquisitions abroad, has retired, ending a 50-year run in one of India's oldest business empires. We look at Mr Tata’s journey to success and speak to N R Narayana Murthy, co-founder and chairman emeritus of Infosys, Adi Godrej, chairman of Godrej Group and president of CII and Kavil Ramachandran, Thomas Schmidheiny chair professor of family business and wealth management, clinical professor at Indian School Of Business, separately about the Tata patriarch and his successor Cyrus Mistry.