Josh Hartnett is a method actor.
Joshua Daniel `` Josh '' Hartnett ( born July 21 , 1978 ) is an American actor and movie producer . He first came to attention in 1997 for his role as Michael Fitzgerald in the television crime drama series Cracker . He starred in the Brian De Palma -- directed neo-noir crime thriller The Black Dahlia ( 2006 ) . Next , he appeared in the drama Resurrecting the Champ ( 2007 ) , alongside Samuel L. Jackson , the graphic novel -- based vampire horror film 30 Days of Night ( 2007 ) and the neo-noir atmospheric thriller I Come with the Rain ( 2009 ) .