Giuliani in 2006

Rudolph William Louis "Rudy" Giuliani (pronounced /ˈruːdi ˌdʒuːliːˈɑːni/; born May 28, 1944) is an American lawyer, businessman and politician from the state of New York who was Mayor of New York City from 1994 to 2001.

A Democrat and Independent in the 1970s, and a Republican from the 1980s to the present, Giuliani served in the United States Attorney's Office for the Southern District of New York, eventually becoming U.S. Attorney. He prosecuted a number of high-profile cases, including ones against organized crime and Wall Street financiers.