Jacques Audiard. That run of films from Read My Lips through to Dheepan is incredible. The ones inbetween (A Prophet, The Beat that my Heart Skipped, Rust and Bone) are all top drawer films. To me, he's the most reliable for high-quality work and has yet to make a bad film (that said, I haven't yet seen his new one, The Sisters Brothers, so he may yet prove me wrong). If you haven't seen any of his films, start with A Prophet and prepare to be blown away. PTA is a good shout, though, as all of his works have something about them, and it is definitely real cinema, even if you don't enjoy the film as a whole.