No Country for Old Men is written by Joel Coen. Joel Coen has edited O Brother, Where Art Thou?
[Human]: I like the movie No Country for Old Men, do you know of similar movies I could watch? [Assistant]: No Country for Old Men is written by Joel Coen who also wrote O Brother, Where Art Thou? [Human]: What genre is "O Brother, Where Art Thou?" ? [Assistant]: It's a crime fiction as well as musical!  [Human]: Oh wow! That's interesting. Has Joel Coen written anything else? 
Sure. If you like drama, he wrote True Grit. He also wrote other romance genre movies like The Notebook.