Dr. Ioannidis, physician-scientist, meta-researcher, and one of the most cited scientists in the world, is a foundational voice in exposomics.
John P. A. Ioannidis, MD, DSc, is a professor at Stanford University with appointments across four departments, where he co-directs the Meta-Research Innovation Center at Stanford (METRICS). Trained in Athens, at Harvard, and at Tufts, he has chaired departments, advised the NCI/NIH on knowledge integration, and served as President of the Association of American Physicians. His PLoS Medicine essay “ Why Most Published Research Findings Are False” remains the most-accessed article in that journal’s history.
Ioannidis has helped shape exposomics since its earliest days. His 2009 Science Translational Medicine perspective (with Loy, Poulton, and Chia) proposed unifying the study of genetic and nongenetic determinants of disease and was among the first to articulate the “exposureome” — anticipating the discovery-driven, exposome-wide approaches that define the field today. That vision continues in his recent work with Arjun Manrai and Chirag J Patel, including a 2026 Nature Medicine atlas of exposome–phenome associations, bringing meta-research rigor, replication, and honest uncertainty to how environmental exposures shape human health.
Fun Fact:
Beyond his scientific work, Dr. Ioannidis is a published literary author in Greek — he has written ten literary books, three of which were shortlisted for the Anagnostis “best book of the year” award. Dr. Ioannidis also wrote the libretto for The Necklace, a one-act opera (composed by Haris Vrontos) staged at Stanford in 2023, in which a Professor of Genetics and a Lecturer in English tumble into a Tristan-and-Isolde romance while sparring over whether the sciences or the humanities matter more.