Irishman Barry Canton became a paper billionaire last Friday, and nobody back home noticed. From Sutton in north County Dublin, the UCD mechanical engineering graduate is a co-founder of a Boston-based biotech company called Ginkgo Bioworks. And on Friday, the company floated on the New York Stock Exchange, closing the day with a valuation of $20 billion. Canton is one five co-founders, each of whom owns about 5 per cent of the company, according to regulatory filings. Canton is married to Reshma Shetty, another co-founder of the business. Between them, they are worth at least €2 billion on paper. Canton…

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