John P. A. Ioannidis (; born August 21, 1965) is a Greek-American physician-scientist, writer and Stanford University professor who has made contributions to evidence-based medicine, epidemiology, and clinical research. Ioannidis studies scientific research itself, meta-research primarily in clinical medicine and the social sciences.
Ioannnidis’ paper on “Why Most Published Research Findings are False” has been the most-accessed article in the history of Public Library of Science (>2.5 million hits).Ionnidis has been a prominent opponent of prolonged lockdowns during the COVID-19 pandemic.

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