Silicon Valley Advisor Arun Ganguly, 38, has been sentenced to up to six years in prison for defrauding start-ups in the US after he pleaded guilty in the New York State Supreme Court to fraud charges. Ganguly impersonated the Winklevoss Twins, Purnendu Chatterjee, founder of principal investment firm The Chatterjee Group, and To further his scheme, Ganguly sent more than 500 emails purporting to be Narenda, Chatterjee, and Howard and Tyler Winklevoss; and forged numerous documents pledging to invest money and make payments to the managing director's private equity fund.