Barnes, Diana Lynn: For the Postpartum Depression and Maternal Mental Health Oral History Project. Dr. Diana Lynn Barnes, PsyD. is a psychotherapist specialized in women’s reproductive health, especially postpartum depression and postpartum psychosis. She discusses her own postpartum depression, motherhood, her work starting a specialized practice, her time as president of Postpartum Support International (2002-2004), and her work in forensics and postpartum legal defenses.