Treating Developmental Trauma and Attachment in Children (TDTAC) is a live, online, 38.25-hour, post-graduate level course for mental health professionals in the fields of child welfare, children’s mental health and adoption / permanency. The course consists of self-directed learning of resources that will be provided, a 1-hour pre class meeting, 31.25 hours of on-line or in-person class, and 6 hours of knowledge implementation classes. TDTAC combines the recent research on Interpersonal Neurobiology with the physiological and relational practices. After completion, participants will be eligible to register as an ATTACh mental health clinician and receive one year membership to ATTACh.