The United States secretary of homeland security is the head of the United States Department of Homeland Security, the federal department tasked with ensuring public safety in the United States. The secretary is a member of the Cabinet of the United States. The position was created by the Homeland Security Act following the attacks of September 11, 2001.

Raymond Walter Kelly is an American police officer who was the longest-serving Commissioner in the history of the New York City Police Department (NYPD) and the first person to hold the post for two non-consecutive tenures. According to its website, Kelly, a lifelong New Yorker, had spent 45 years in the NYPD, serving in 25 different commands and as Police Commissioner from 1992 to 1994 and again from 2002 until 2013. Kelly was the first man to rise from Police Cadet to Police Commissioner, holding all of the department's ranks, except for Three-Star Bureau Chief, Chief of Department and Deputy Commissioner, having been promoted directly from Two-Star Chief to First Deputy Commissioner in 1990. After his handling of the World Trade Center bombing in 1993, he was mentioned for the first time as a possible candidate for FBI Director. After Kelly turned down the position, Louis Freeh was appointed.