John Carreyrou

American investigative journalist whose Bad Blood exposed the Theranos fraud and stands as one of the most gripping works of business investigative reporting of the decade.

John Carreyrou is an investigative reporter at the Wall Street Journal whose reporting exposed the Theranos fraud beginning in 2015. Bad Blood: Secrets and Lies in a Silicon Valley Startup, published in 2018, is the full account of Elizabeth Holmes, the company she built around a blood-testing technology that didn’t work, and the years of deception required to sustain the illusion. Carreyrou had access to dozens of former employees and the documentary record of an eventual federal investigation, and the result is investigative journalism of exceptional quality: precise, well-sourced, and structured with novelistic momentum.

What makes Bad Blood compelling beyond the fraud itself is Carreyrou’s portrait of the Valley culture that enabled it. Holmes’s ability to raise hundreds of millions of dollars, recruit a prestigious board, and intimidate employees and journalists for years is not just a story about one person’s dishonesty — it is an indictment of a world that chose to believe because believing was convenient. The book is a significant work of institutional critique disguised as a true-crime thriller.

Carreyrou’s reporting is careful and his sourcing is exceptional. He names his sources, describes the evidence behind each claim, and is transparent about what he knows versus what he inferred. Bad Blood is a model of how investigative journalism should be done and how it should be written. For readers interested in Silicon Valley, corporate fraud, or the mechanics of large-scale deception, it is essential reading.