ANDREI I. HOLODNY is Professor of Radiology at the Weill Medical College of Cornell University and Attending Neuroradiologist at Memorial Sloan-Kettering Cancer Center, New York, New York, USA. He is the Chief of the Neuroradiology Section and Director of the Functional MRI Laboratory at Memorial Sloan-Kettering. Dr. Holodny is the Founding President of the American Society of Functional Neuroradiology and past-President of the Eastern Neuroradiological Society. Dr. Holodny's studies concentrate principally on functional imaging of central nervous system tumors including blood oxygen level dependent functional MRI and diffusion tractography.