Dr. Christopher Kowalski is a PhD graduate of the University of Western Ontario Department of Psychology, specializing in personality and psychological measurement. He has a strong background in personality psychology, and his research primarily focuses on 1) the study of trait rumination and 2) the study of dark personality traits (i.e., the Dark Tetrad). He has published 25 articles in peer-reviewed journals, including Personality and Individual Differences, Journal of Personality Assessment, Journal of Personality, and Cognitive Therapy and Research, as well as three book chapters and three encyclopedia entries.