While many of India's corporate titans are regulars on the World Economic Forum circuit, Roy, with a bushy moustache and often wearing a black waistcoat over a white shirt or a black Nehru jacket, is often photographed with celebrities such as cricket stars.
He does not feature on the Forbes list of 100 richest Indians, although he ranked 10th on India Today magazine's "power list" last year.
Unlike many of India's hereditary tycoons, Roy had humble business origins.
He started out in 1978 with a mechanical engineering diploma, Rs 2000 and a Lambretta scooter in Gorakhpur, Uttar Pradesh.
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