How John Carreyrou battled corporate surveillance and intimidation to expose a multibillion-dollar Silicon Valley start-up as a fraud. : How John Carreyrou battled corporate surveillance and intimidation to expose a multibillion-dollar Silicon Valley start-up as a fraud. In late September of 2015, Elizabeth Holmes, the CEO of the once-high-flying but now disgraced Silicon Valley health-care company Theranos, was in the News Corp. office of Rupert Murdoch. She had first met Murdoch in 2014 to pitch him on Theranos, and convinced him to pour $125 million into the company, making him the largest investor.