A Complete Biography of Mukesh An Indian Billionaire Businessman and the Chairman, Managing Director, and Largest Shareholder of Reliance Industries Ltd. Mukesh Dhirubhai Ambani (born 19 April 1957) is an Indian billionaire businessman, and the chairman, managing director, and largest shareholder of Reliance Industries Ltd. (RIL), a Fortune Global 500 company and India's most valuable company.