Ratan Tata was born in Bombay, now Mumbai, on 28 December 1937, and is the son of Naval Tata (born in Surat). His biological maternal grandmother had been the sister of Hirabai Tata, wife of group founder Jamshedji Tata. His biological grandfather, Hormusji Tata, had belonged to the broader Tata family; Ratan therefore was a Tata by birth. Parents Naval and Sonoo separated in 1948 when Ratan was 10, and he was subsequently raised by the widow of Sir Ratanji Tata, his grandmother, Navajbai Tata, who formally adopted him through the J. N. Petit Parsi Orphanage. He has a half-brother, Noel Tata (from Naval Tata’s second marriage with Simone Tata), with whom he was raised. His first language is Gujarati.

He studied at the Campion School, Mumbai till the 8th class, followed by Cathedral and John Connon School, Mumbai and at Bishop Cotton School in Shimla, and, in 1955, graduated from Riverdale Country School in New York City. In 1959, he then received a degree in Architecture from Cornell University, and in 1975, attended the seven-week Advanced Management Program of Harvard Business School — an institution which he has since endowed.

Promoted to management during the 1970s; he then endured trial by ordeal and was able to turn Group company National Radio and Electronics (NELCO) around, only to see it collapse during an economic slowdown. In 1991, J. R. D. Tata stepped down as chairman of Tata Sons, naming him his successor. When he settled down into the new role, he faced stiff resistance from many companies heads, some of whom had spent decades in their respective companies and rose to become very powerful and influential due to the freedom to operate under JRD Tata. He began replacing them by setting a retirement age, and then made individual companies report operationally to the group office and made each contribute some of their profit to build and use the Tata group brand. Innovation was given priority and younger talent was infused and given responsibilities. Under his stewardship, overlapping operations in group companies were streamlined into a synergised whole, with the salt-to-software group exiting unrelated businesses to take on globalisation.

Ratan Tata received the Padma Bhushan in 2000 and Padma Vibhushan in 2008, the third and second highest civilian honours awarded by the Government of India.

In 2011, Ratan Tata stated, “I came seriously close to getting married four times and each time I backed off in fear or for one reason or another.”

Ratan Tata resigned his executive powers in the Tata group on 28 December 2012, upon turning 75, appointing as his successor, Cyrus Mistry, the 44-year-old son of Pallonji Mistry of the Shapoorji Pallonji Group, the largest individual shareholder of the group and related by marriage. On 24 October 2016, Cyrus Mistry was removed as the chairman of Tata Sons and Ratan Tata was made interim chairman. The decision went through intense media scrutiny that made many scrutinize the root causes of the sudden removal, and the resultant crisis. A selection committee was formed to find a successor. The selection committee consisted of Mr. Tata, TVS Group head Venu Srinivasan, Amit Chandra of Bain Capital, former diplomat Ronen Sen and Lord Kumar Bhattacharya. All of them, except Mr. Bhattacharya, were on the board of Tata Sons. On 12 January 2017, Natarajan Chandrasekaran was named as the chairman of Tata Sons, a role he assumed in February 2017.

In 2013, he was appointed to the Board of Trustees of the Carnegie Endowment for International Peace.

During the 21 years he led the Tata Group, revenues grew over 40 times, and profit, over 50 times. Where sales of the group as a whole, overwhelmingly came from commodities when he took over, the majority sales came from brands when he exited. He boldly got Tata Tea to acquire Tetley, Tata Motors to acquire Jaguar Land Rover and Tata Steel to acquire Corus. All this turned Tata from a largely India-centric group into a global business, with over 65% revenues coming from operations and sales in over 100 countries. He conceptualised the Tata Nano car. In 2015, He explained in an interview for the Harvard Business School’s Creating Emerging Markets project, the development of the Tata Nano was significant because it helped put cars at a price-point within reach of the average Indian consumer.

In February 2015, Ratan took an advisory role at Kalari Capital, a venture capital firm founded by Vani Kola.

Tata invested personal savings in Snapdeal – one of India’s leading e-commerce websites –and, in January 2016, Teabox, an online premium Indian Tea seller, and CashKaro.com, a discount coupons and cash-back website. He has made small investments in both early and late stage companies in India, such as INR 0.95 Cr in Ola Cabs. In April 2015, it was reported that Tata had acquired a stake in Chinese smartphone startup Xiaomi. In October 2015, he partnered with American Express, investing in Bitcoin venture Abra. In 2016, he invested in Nestaway an online portal to find fully furnished flats for bachelors which later acquired Zenify to start family rental segment and online pet care portal, Dogspot. Tata Motors rolled out the first batch of Tigor Electric Vehicles from its Sanand Plant in Gujarat, regarding which Ratan Tata said, “Tigor indicates a willingness to fast-forward India’s electric dream. The government has set an ambitious target to have only electric cars by 2030.”

In one of the most dramatic developments in the recent past, the board of directors of Tata Group on 24 October 2016 voted for the removal of its chairman Cyrus Mistry with immediate effect and made Ratan Tata the interim chairman, and in February 2017, Mistry was removed as a director for Tata Sons. The National Company Law Appellate Tribunal(NCLAT) had decided in December 2019 that the removal of Cyrus Mistry as the Chairman of Tata Sons was illegal and that he should be reinstated. India’s Supreme Court heard an appeal by the $111-billion conglomerate to quash the NCLAT order that directed the Tata group to rehire the man it fired as chairman. Ratan Tata is personally leading the charge in the case, and filed a separate petition challenging the ruling in the Supreme Court. The Supreme Court has stayed the National Company Law Appellate Tribunal (NCLAT) order that allowed Cyrus Mistry to be reinstated as Tata Sons chairman in January 2020..

In October 2016, Tata Sons removed Cyrus Mistry as its chairman, nearly 4 years after he took over the reins of the over $100 billion conglomerate, Ratan Tata made a comeback, taking over the company’s interim boss for 4 months. On 12 January 2017, Natarajan Chandrasekaran was named as the chairman of Tata Sons, a role he assumed in February 2017.