His primary research interest is in the application of biomarkers for use in personalized medicine for depression, posttraumatic stress disorder, and anxiety disorders. His other research interests include testing investigational medications for these disorders, and in the design and conduct of clinical trials. Dunlop also serves as the medical director of the Emory Healthcare Veterans Program and supervises a psychopharmacology specialty clinic as part of the psychiatry residency training program at the Emory University School of Medicine.