Author of the Princess Bride, which is one of my favorite novels. I first read it in college, it was sort of an in-joke thing with my friends freshman year. The movie is good, but not nearly as good as the book, which is punctuated with jokes in parentheses.
The soundtrack is also really good. By Mark Knopfler, of Dire Straits.
Perhaps released a bit too late (as a movie) to influence D&D, but I can think of at least half a dozen R.O.U.S. references in OSR products. So I know I'm not the only fan.