Charles E. Kahn, Jr., M.D., M.S. was installed as president of the American Roentgen Ray Society (ARRS), the first and oldest radiology society in the United States. Dr. Kahn, professor of radiology at the Medical College of Wisconsin (MCW), and radiologist at Froedtert Hospital, has authored more than 85 peer-reviewed articles and given more than 140 presentations at national and international radiology meetings. ARRS is dedicated to the advancement of medicine through radiology and its allied sciences. ARRS holds annual scientific meetings and publishes the American Journal of Roentgenology, a peer-reviewed journal with a worldwide circulation of more than 25,000.