Prior to his appointment as Chief of Staff, Dr. Crossley served as Associate Chief of Staff/Education. He has held the rank of Professor of Medicine at the University of Minnesota Medical School, and a well-known expert in infectious diseases. Dr. Crossley received his clinical and research training in infectious diseases in the Channing Laboratory at Boston City Hospital. He is board certified in Internal Medicine and Infectious Diseases. He is a Fellow of the American College of Physicians, the Infectious Diseases Society of America and the Society for Healthcare Epidemiology of America. He received a Master of Healthcare Administration degree from the University of Minnesota in 2000. Another major interest is the clinical nature and epidemiology of infections in elderly people and in nursing home residents.