He is an attending child neuropsychiatrist, main sub-Investigator, and the medical co-director of the Fragile X Clinic at Kennedy Krieger Institute, Johns Hopkins Medical Institutions. Under his leadership, the Clinic has been critical in establishing the Institute’s Clinical Trials Unit. He is also an assistant professor of psychiatry & behavioral sciences at Johns Hopkins University School of Medicine. Dejan is board certified by the American Board of Psychiatry and Neurology in adult, child, and adolescent psychiatry. He is an active member of the Fragile X Clinical and Research Consortium and its Clinical and Clinical Trials Committees, respectively.