Karen Cosby, MD, FACEP, CPPS is an academic emergency medicine physician who has practiced and taught emergency medicine for 30 years. As Associate Professor of Emergency Medicine at Rush University and senior emergency physician at Cook County Hospital she led departmental and hospital wide Quality and Oversight divisions and focused her academic work on better understanding medical error and finding system solutions to improve patient safety. As a Program Director of the Diagnostic Excellence Initiative at the Gordon and Betty Moore Foundation, she manages a portfolio of grants designed to improve measurement of diagnostic quality. She is one of the founding members of SIDM and helped originate and lead the SIDM Fellowship in Diagnosis, and since joining the Foundation has helped establish similar opportunities for fellows and scholars with the National Academy of Medicine and the Society of Bedside Medicine. She has edited two books: Diagnosis Interpreting the Shadows and Patient Safety in Emergency Medicine.