Tata Consultancy Services Ltd, commonly known as TCS, is a multinational consulting company headquartered in Mumbai, India. TCS was founded in 1957 by N.V. Ramaswamy Iyer and Mr. V.K. Gopalakrishnan. About 380,000 people are employed by the company, which operates in over 60 countries. TCS is a Fortune 500 company and ranks fourth in the Indian market after Reliance Industries Ltd, Infosys Ltd, and Wipro Ltd. In 2013, it was the fastest-growing IT services company in the world with revenue growth of 17%. TCS has been certified as a “Good Housekeeping” company since 1968 and has maintained this accreditation for more than 40 years. The company's quality management system has also been certified by ISO 9001:2008. In 1972, TCS established an environmental management system (EMS) to help manage its environmental impact.