Azim Premji transformed Wipro from a small vegetable oil manufacturer into one of the largest IT outsourcing companies in the world. He took over as chairman of Wipro in 1966 at age 21 and led the company's diversification into IT services. Today, Wipro has over 122,000 employees worldwide and Premji has a net worth of $15.9 billion, making him one of the richest people in India.