John Carreyrou is a French-American investigative reporter at The New York Times. Carreyrou worked for The Wall Street Journal for 20 years between 1999 and 2019 and has been based in Brussels, Paris, and New York City. He won the Pulitzer Prize twice and helped expose the fraudulent practices of the multibillion-dollar blood-testing company Theranos in a series of articles published in The Wall Street Journal.