New York City Mayor Bill de Blasio appointed Daniel Nigro to lead the nation's largest fire department.
De Blasio announced the appointment Friday at a ceremony at the city's fire academy.
Nigro helped rebuild the fire department after the Sept. 11 terrorist attacks. The attacks killed 343 members of the FDNY and hundreds more retired in the months that followed.
Nigro was named chief of department, the FDNY's highest-ranking uniformed post, after the attacks. He retired in 2002.
Both de Blasio and Nigro vowed to work on diversifying the FDNY, which is nearly 90 percent white.
De Blasio said outgoing commissioner Salvatore Cassano was not considered a candidate to stay on.
The FDNY has 10,000 firefighters and 3,000 emergency medical service personnel.