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Justine Welsh, MD is a Child/Adolescent and Addiction Psychiatrist and Director of the Emory Healthcare Addiction Services. Dr. Welsh completed her training in general psychiatry at Emory University Medical School. She subsequently completed her child and adolescent psychiatry fellowship at Cambridge Health Alliance, a Harvard Medical School affiliate, and an addiction psychiatry fellowship through Massachusetts General Hospital, McLean Hospital, and Brigham and Women’s Hospital. Dr. Welsh’s area of clinical focus and research is in the treatment and prevention of adolescent substance use disorders, as well as opioid use in young adults. She has been the recipient of grant funding from the American Academy of Child and Adolescent Psychiatry, the Georgia Clinical and Translational Science Awards Program, and the National Institute on Drug Abuse.


Kallio Hunnicutt, PhD received her Bachelor of Science in Child and Family Development and Psychology from the University of Georgia and completed her PhD in clinical psychology at Northwestern University’s Feinberg School of Medicine in Chicago, IL. Dr. Hunnicutt has worked with individuals with substance use disorders in residential and outpatient settings, and specializes in providing Cognitive Behavioral Therapy to adults with substance use disorders and co-occurring mood and anxiety problems. Prior to joining the Emory University School of Medicine Faculty in 2017, Dr. Hunnicutt worked as the PTSD/Substance Use Disorder psychologist at the James J. Peters VA in Bronx, NY. Dr. Hunnicutt is actively involved in research focused on enhancing therapeutic outcomes for substance use disorders in women and is involved in residency and psychology graduate student education.   


Joseph Mathias, MD is an Addiction Psychiatrist at Emory Healthcare. Dr. Mathias completed his training in General Psychiatry at Berkshire Medical Center in Pittsfield, Massachusetts. He started to develop an interest in addiction treatment during residency as his local community in Western Massachusetts suffered greatly due to the opioid epidemic. He served as Chief Resident his final year of residency and helped treat patients with opioid use disorder at Berkshire County’s community mental health buprenorphine clinic. Following residency, Dr. Mathias completed his Addiction Psychiatry Fellowship at Emory University. Dr. Mathias has particular interest in the treatment and prevention of substance use disorders in adolescents/young adults. He is also actively involved in residency and fellowship education.


Rex Foster, MD is a board certified anesthesiologist with subspecialty certifications in Critical Care Medicine, and Pain Management. He has been in private practice in the Atlanta area for over 30 years. He is also board certified in Addiction Medicine by the American Board of Preventative Medicine after recently completing an Addiction Medicine fellowship at the University of Florida. His primary interest is treating patients with co-occurring chronic pain and substance use disorders.


Maggie Mataczynski, BA is the research coordinator for the EAST service. She graduated from the University of Wisconsin Madison with a Bachelor's in psychology. She is interested in research focusing on substance use disorders in young adults and adolescents.

Addiction Services