I think these two are my favorites. They kinda hurt my eyes but I love the intricacies of them. If you look at the "Love Counts" poster, you can see the use of numbers (clever!) to create the image. You can also see the theater name in one of the lines toward the bottom but you have to work for it. They're mostly in German so I don't know what half of them say.
I've tried to identify these fonts but I give up. There's always one little thing off. It's also possible that since the designer is German (Austrian?) he's using different fonts than what I can find. They're all sans serif and pretty classic, though. The font itself seems less important than the way he uses it.
He seems to like a black, white, gray, red palette. He also likes to use type in curves.
Many of his designs for the theater are type-focused. He's really able to use type and some imagery to capture attention in a simple way.
Some of his designs get a little "messy" too, though.