John Tresch is Professor and Mellon Chair in History of Art, Science, and Folk Practice at the Warburg Institute. Trained in History and Philosophy of Science and in Anthropology, his work focuses on changing methods, instruments, and institutions in the sciences, arts, and media; connections among disciplines, cosmology, social order, and ritual; and shifting definitions of the rational and real. He has held fellowships at the New York Public Library, the Institute for Advanced Studies, and the Max Planck Institute for the History of Science, and has been visiting researcher at King's College London and the Ecole des Hautes Etudes en Sciences Sociales.