Nicholas Carleton, Ph.D., is a Professor of Clinical Psychology, a registered clinical psychologist in Saskatchewan, and the Scientific Director for the Canadian Institute for Public Safety Research and Treatment. He has published more than 140 peer-reviewed articles, book chapters, and encyclopaedia entries exploring the fundamental bases of anxiety and related disorders. He has completed more than 360 national and international conference presentations. His interests include biopsychosocial assessment and treatment of trauma-related disorders, focusing on lower-order (e.g., intolerance of uncertainty) and higher-order (e.g., extraversion) factors. Carleton is principal investigator on the Royal Canadian Mounted Police Longitudinal PTSD Study.