John Jay Shannon, MD. CEO of Cook County Health & Hospitals System (Chicago). Dr. Shannon joined Cook County Health as chief of clinical integration in 2013 before becoming CEO in 2014. He joined the staff of Chicago-based John H. Stroger, Jr. Hospital of Cook County in 1990 after earning his medical degree from Chicago-based Rush Medical College and completing his residency at Dallas-based University of Texas Southwestern Affiliated Hospitals. At Stroger, he went on to serve as director of the adult asthma clinic, associate chair of the department of medicine and chief of the divisions of pulmonary and critical care medicine. From 2007 to 2012 he served as executive vice president and CMO at Parkland Health & Hospital System in Dallas.
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