Ian Hacking is University Professor Emeritus at the University of Toronto. He holds the chair of Philosophy and History of Concepts at the College de France. Among his many books, the most recent is Rewriting the Soul.
Lorraine Daston is director at the Max Planck Institute for the History of Science and honorary professor at the Humboldt-Universit�t, Berlin.Gregg Mitman is William Coleman Professor of the History of Science and professor of medical history and science and technology studies at the University of Wisconsin, Madison.