More than half of the 80 000 emergency personnel, volunteers, and recovery and cleanup workers known to have responded to the September 11, 2001, terrorist attacks at the World Trade Center, the Pentagon, and the crash site near Shanksville, Pennsylvania, have at least 1 certified physical or mental health condition related to their exposures. Pulmonologist David Prezant, MD, chief medical officer for the Fire Department of the City of New York and a professor of medicine at Albert Einstein College of Medicine in the Bronx, shares his 9/11 story and updates us on how the responders are doing 20 years after the events. Related Content: Twenty Years After 9/11, Responders Are Still Healing