For the Postpartum Depression and Maternal Mental Health Oral History Project. Michael O’Hara has been a leading researcher in the psychology of postpartum depression since the late-1970s/early-1980s. We discussed his entry into psychology and perinatal mental health issues in particular, his involvement in the Marcé Society for Perinatal Mental Health, and his overall research trajectory. We discussed his transition from cognitive behavioral to interpersonal psychotherapy, changes in the field with regard to hormones and neuroscience, and changing funding climates. WE also discussed the relationship between perinatal health researchers and activist. PPD and race, and the politics of identifying postpartum depression as a discrete disease. The period discussed was primarily the 1980s-2010s.