Kunal Nayyar's real accent is somewhat less pronounced than his character Rajesh's. In 2007 he stated: "For that character, it's slightly thicker. But if I am in New Delhi, that is how I would speak. I'm going home next week and when I come back, my accent's already thicker."
Although he was born in London, his family moved to India when he was only 4 years old, so he was raised surrounded by people that spoke with an Indian accent instead of with an English accent.
In 2004, he made his screen debut in the film S.C.I.E.N.C.E as Pizza Man and made a guest appearance as Youssef Zidan in a 2007 episode of NCIS. Big Bang is his biggest credit.
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