Marshall Bruce Mathers III ( born October 17 , 1972 ) , better known by his stage name Eminem and by his alter ego Slim Shady , is an American rapper , record producer , songwriter , and actor .
Marshall Bruce Mathers III , ( born October 17 , 1972 ) , better known by his stage name Eminem and his other name Slim Shady , is an American rapper , record producer , songwriter , and actor .