Ketil Slagstad is a physician-historian and postdoctoral researcher at the Institute of the History of Medicine and Ethics in Medicine at Charité – Universitätsmedizin Berlin. His research focuses on the production, negotiation, and contestation of medical knowledge between medical experts, patients, and activists in the history of trans medicine and the HIV/AIDS epidemic. He is currently conducting a praxeographic analysis of twentieth century clinical research and biological psychiatry. Slagstad has published in both history of science and medical journals (including Isis, Social History of Medicine, and New England Journal of Medicine). His first book in English, Standardizing Sex: A History of Trans Medicine, was published by The University of Chicago Press in September 2025.