Few business careers have been as spectacular as Hamdi Ulukaya's. He bought an 85-year-old yogurt factory in upstate New York in 2005 and sold his first pot of Chobani "Greek" yogurt 18 months later. This year he expects to sell more than $1 billion-worth of it. Greek-style yogurt's share of America's $6.1 billion market has risen from negligible when Chobani started to nearly half. "No category changed faster," boasts Mr Ulukaya, the sole owner of the firm that makes Chobani.
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