Ratan Tata has led the Tata Group, India's largest conglomerate, since 1991. Under his leadership, the Tata Group has expanded into various sectors such as engineering, energy, chemicals, services, consumer products, information systems, automobiles, and philanthropy. The Tata Group operates over 80 companies and is India's largest private employer with over 200,000 employees. It has transformed from a diversified industrial group into a global enterprise through strategic acquisitions and expanding into new business lines and international markets.