John Carreyrou

John Carreyrou (/ˌkæriˈruː/) 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.

John Carreyrou was born to French journalist Gérard Carreyrou and an American mother. He grew up in Paris. Carreyrou graduated from Duke University in 1994 with a B.A. in political science and government.

After graduation, he joined the Dow Jones Newswires. In 1999, he joined The Wall Street Journal Europe in Brussels. In 2001, he moved to Paris to cover French business and other topics such as terrorism. In 2003, he was appointed the deputy bureau chief for Southern Europe. He covered French politics and business, Spain, and Portugal. By 2008, he was the deputy bureau chief and later bureau chief of the health and science bureau in New York.

In late 2015, spurred by a deep investigation carried out by Eleftherios Diamandis and a tip by pathologist Adam Clapper, Carreyrou began a series of investigative articles on Theranos, the blood-testing start-up founded by Elizabeth Holmes, that questioned the firm's claim to be able to run a wide range of lab tests from a tiny sample of blood from a finger prick. Holmes turned to Rupert Murdoch, whose media empire includes Carreyrou's employer, The Wall Street Journal, to kill the story. Murdoch, who became the biggest investor in Theranos in 2015 as a result of his $125 million injection, refused the request from Holmes saying that "he trusted the paper's editors to handle the matter fairly". In May 2018, Knopf published Carreyrou's book-length treatment of the topic, Bad Blood: Secrets and Lies in a Silicon Valley Startup. Carreyrou also features prominently in a documentary about Theranos called The Inventor: Out for Blood in Silicon Valley.

In August 2019, Carreyrou left the Wall Street Journal, opting for paid speaking engagements that are banned by the newspaper. For future plans, he commented "I want to keep writing non-fiction books for the second part of my career".

In 2021, Carreyrou released a podcast called "Bad Blood: The Final Chapter" covering the trial of Elizabeth Holmes.

In March 2022, Hulu released The Dropout, a miniseries about Elizabeth Holmes and the Theranos scandal, where Carreyrou is portrayed by Ebon Moss-Bachrach.

In early 2023 Carreyrou joined The New York Times as an investigative reporter.