Alexander G. Khandji, MD, FACR, is professor of radiology in neurological surgery and neurology, vice-chair for clinical affairs in the department, and associate director of the radiology service at NewYork-Presbyterian Hospital. He was chief resident during his residency here and later completed training in neuroradiology at the Neurological Institute. His special interests include MRI, diagnostic neuroangiography and percutaneous diagnostic and interventional spinal procedures. He is especially interested in developing noninvasive techniques to evaluate vascular lesions of the brain and the spinal cord using MR arterial spin labelling. He also involved with the neuroendocrine unit here at Columbia to evaluate paients with endocrine disorders using MRI as well as venous petrosal sinus sampling.