Gangs of New York . The screenplay is by Jay Cocks , Steven Zaillian , and Kenneth Lonergan . Kenneth Lonergan ( born October 16 , 1962 ) is an American playwright , screenwriter , and director . He also won the BAFTA Award for Best Original Screenplay for Manchester by the Sea at the 70th British Academy Film Awards .
Kenneth Lonergan is a writer of screenplays.