Robert Califf — Commissioner, FDA (2022-2025)

**Robert Califf** served as the Commissioner of the **U.S. Food and Drug Administration (FDA)** from 2022 to January 2025, the nation's top regulator for drugs, medical devices, food safety, tobacco, and increasingly, digital health technologies and AI-powered medical tools. He is a cardiologist, clinical trial expert, and the most cited clinical researcher in the United States by some measures.