Michelle Obama, who headed the medical center’s community and external affairs department for seven years, helped found an ongoing collaborative to create medical homes for people on Chicago’s South Side. The medical center has 532 beds, more than 9,500 employees, more than 700 attending physicians, nearly 900 residents and fellows and more than 1,500 nurses. University of Chicago Medical Center has an Aa3 bond rating with Moody’s Investor Services. Affiliated with the University of Chicago Pritzker School of Medicine, it is staffed by more than 700 physicians from the University of Chicago Physicians Group.