Who knows? If it is, it must be powerful if he's the guy they seem to have handed the keys for the DC Cinematic Universe to.Does Zack Snyder has some serious blackmail on these studios? How does he keep getting these jobs? Did someone seriously sit down to 300 and think, "My god, he would be perfect for The Fountainhead! Look at all those shades of brown!"
Besides which, he's also said that he'd like to do a movie about George Washington, because he's inspired by the classic painting "Washington Crossing the Delaware" which reminds him of 300.