About the Author

Ronald Melzack is Professor Emeritus of Psychology at McGill University. After receiving his Ph.D. from McGill, he carried out research at the University of Oregon Medical School, the University of Pisa and University College London.

Patrick D. Wall (1925 - 2001) was Professor Emeritus at the University of London. After receiving his medical degree from Oxford, he worked at the Universities of Yale, Chicago and Harvard, and at the Massachusetts Institute of Technology