Rudolph William Louis Giuliani is an American politician, attorney, businessman and public speaker who served as the 107th Mayor of New York City from 1994 to 2001. He currently acts as an attorney to President Donald Trump. Politically a Democrat, then an Independent in the 1970s and a Republican since the 1980s, Giuliani served as United States Associate Attorney General from 1981 to 1983. That year he became the United States Attorney for the Southern District of New York, holding the position until 1989. He prosecuted cases against the American Mafia and against corrupt corporate financiers.