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"(Avie) Tevanian left Apple on March 31, 2006, and joined the board of Theranos, Inc. He resigned from it in late 2007, with an acrimonious ending as he faced legal threats and was forced to waive his right to buy a company cofounder's shares, actions he believed were in retaliation for the skepticism he was often alone in expressing about the company's finances and progress in developing its technology at board meetings."

Yup, he was right.

https://en.wikipedia.org/wiki/Avie_Tevanian