Dr. Pettit conducts research on depression, anxiety, and suicidal behaviors in childhood and adolescence. He has a particular interest in the course of depression, anxiety, and suicidal behaviors over time, including interpersonal and cognitive factors that contribute to the onset, maintenance, and recurrence of these behaviors. His research also focuses on the development and evaluation of interventions for these behaviors. Dr. Pettit is the author of two books and more than 90 research articles and book chapters. His research program is funded by the National Institute of Mental Health.