Charles A. Janeway, Jr. is on the faculty of the Yale University School of Medicine. He is Professor of Immunology and an Investigator of The Howard Hughes Medical Institute. Paul Travers is the Deputy Director of the Anthony Nolan Research Institute, London. Mark Walport is Professor of Medicine, Head of the Division of Medicine, Imperial College School of Medicine, London. Mark Shlomchik is on the faculty at Yale University School of Medicine, where he is Associate Professor of Laboratory Medicine and Immunobiology. He is also the Associate Director of the Blood Bank at Yale-New Haven Hospital.