Acacia Parks is Assistant Professor of Psychology at Hiram College, USA. She received her Ph.D. from the University of Pennsylvania. Her research focuses on the efficacy of positive interventions, and the psychological and behavioral characteristics of individuals who use them. She is an associate editor of the Journal of Positive Psychology, as well as co-editor of "Activities for Teaching Positive Psychology" (APA Press). Dr. Parks is an active teacher of both positive psychology and critical writing. Stephen Schueller is a Research Assistant Professor of Preventive Medicine at Northwestern University, Feinberg School of Medicine and a faculty member of the Center for Behavioral Intervention Technologies (CBITs). He received his Ph.D. from the University of Pennsylvania and completed his clinical internship and postdoctoral fellowship at the University of California, San Francisco. His research focuses on developing, implementing, and evaluating Internet and mobile interventions for the treatment and prevention of depression and promotion of well-being. He is an associate editor of the Journal of Positive Psychology. Dr. Schueller is a licensed clinical psychologist and integrates positive psychology into his conceptual and applied work.