John Carreyrou joined the Wall Street Journal in 1999 and was based in Brussels, Paris, and New York for the paper. John has covered a number of topics during his career, ranging from Islamist terrorism when he was on assignment in Europe to the pharmaceutical industry and the US healthcare system. His reporting on Theranos, the blood-testing startup founded by Elizabeth Holmes, was recognized with a George Polk award, and is chronicled in his book Bad Blood: Secrets and Lies in a Silicon Valley Startup.

Born in New York and raised in Paris, he currently resides in Brooklyn with his wife and three children.