Adrian Wells is Professor of Clinical and Experimental Psychopathology at the University of Manchester, UK. His research interests are in the areas of cognitive theory and therapy and emotional disorders. He has made major contributions to treatments for anxiety disorders and he is the originator of Metacognitive Therapy (MCT). His treatments are included in NHS NICE guidelines. Gerald Matthews is Research Professor at the Institute for Simulation and Training, University of Central Florida, USA. His research focuses on human factors, cognitive models of personality and individual differences, and task-induced states of stress and fatigue.