Lynn E. Alden, Ph.D., is a clinical psychologist and Professor of Psychology at the University of British Columbia (Vancouver, British Columbia). Her research interests include studying the role of cognitive interpersonal processes in anxiety disorders with a focus on Social Anxiety Disorders and Post-traumatic Stress Disorder.

Leonard M. Horowitz, Ph.D., was Professor Emeritus at Stanford University (Stanford, CA). His research focused on interpersonal processes related to personality and psychopathology.

Aaron L. Pincus, Ph.D., is a clinical and personality psychologist and professor of psychology at The Pennsylvania State University (University Park, PA). His research interests include interpersonal theory and interpersonal circumplex, intraindividual variability and person-situated integration, and personality disorders and pathological narcissism.

Jerry S. Wiggins (1931-2006), Ph.D., was a personality and clinical psychologist known for his psychometrics and personality theory writings, and for developing measures of interpersonal behavior.