His areas of interest include: Intervention research on co-occurring problems of HIV, substance abuse, mental illness, and criminal justice involvement; HIV prevention and epidemiology; Substance abuse and mental illness; Criminal justice affected populations; Use of multimedia tools in intervention development and delivery; Dissemination/translational research; and Criminal justice content in social work education. Epperson has over 15 years of clinical and administrative social work experience in mental health, substance abuse, and criminal justice settings.