Leslie S. Greenberg, PhD, is Professor of Psychology and Director of the Psychotherapy Research Center at York University in Canada. He is the coauthor of Facilitating Emotional Change and coeditor of the Handbook of Experiential Psychotherapy, among many other publications.

• All titles by Leslie S. Greenberg

Sandra C. Paivio, PhD, is Professor of Psychology at the University of Windsor in Canada. Formerly, she was on the Psychology faculty at the University of Saskatchewan.