Born in Rome, Guerrieri made his acting debut at the age of nine on the television show Lazarillo, as well as performing in Ettore Scola's 1977 film A Special Day.
As a voice actor, Guerrieri serves as the official Italian voice of Ben Stiller,[1] as well as dubbing John Corbett, Steve Carell, Owen Wilson, Charles Martin Smith, Steve Zahn and Joseph Fiennes.
He also dubbed Matthew Fox in Lost as well as Jason Bateman in Arrested Development.
He has also performed Italian voice dubbing roles in anime productions.
Guerrieri is married to voice actress Roberta Greganti.