Josh Hartnett is in the film industry.
Joshua Daniel `` Josh '' Hartnett ( born July 21 , 1978 ) is an American actor and movie producer . Hartnett had starring roles in the war film Pearl Harbor , the drama O , the war film Black Hawk Down , the romantic comedy 40 Days and 40 Nights , and other films . 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 ) . From 2014 to 2016 , he starred as Ethan Chandler in the horror TV series Penny Dreadful , for which he was nominated for a Fangoria Chainsaw Award .