David J. Schretlen, Ph.D., ABPP is a Professor of Psychiatry and Radiology at the Johns Hopkins University School of Medicine. He completed a doctorate in clinical psychology at the University of Arizona in 1986 following an internship at McLean Hospital, Harvard Medical School. He then completed post-doctoral training in neuropsychology and rehabilitation at the UCLA Neuropsychiatric Institute. While there, Dr. Schretlen was awarded a Mary E. Switzer fellowship by the National Institute of Disability and Rehabilitation Research. He is a board-certified neuropsychologist, serves on the editorial boards of several scientific journals, and has published over 300 articles, monographs, book chapters, and abstracts. His research interests include the elucidation of cognitive, neuroimaging, and metabolic biomarkers of psychoses, other neuropsychiatric disorders, and normal aging. Dr. Schretlen currently is doing research on the use of transcranial direct current stimulation (tDCS) to enhance cognitive functioning in schizophrenia, autism, and age-related memory decline. Finally, he is developing methods to increase the diagnostic sensitivity and specificity of neurocognitive measures for persons of diverse background. In connection with this work, he founded and directs the International Neuropsychological Database Initiative (www.inndi.org).