P. N. Singer is a Wellcome Research Fellow in the Department of History, Classics and Archaeology at Birkbeck, University of London. His research centres on Graeco-Roman medicine, especially Galen; on the interface of philosophical and medical ideas; and especially on the history of conceptions of the mind, psychology and ethics. He published the first major collection of texts by Galen in English translation with Galen: Selected Works (1997) and edited Galen: Psychological Writings (Cambridge, 2014), the first volume of the series Cambridge Galen Translations. He is also co-editor of a major study of conceptions of mental illness in the Graeco-Roman world, Mental Illness in Ancient Medicine: From Celsus to Paul of Aegina, (with Chiara Thumiger, 2018), and author of a range of articles on ancient concepts of psychology, the emotions, health, disease classification, pharmacology and physiology, as well as on aspects of ancient drama and performance culture.