C. S. Lewis is the best example I can think of. Besides writing fantasy and science fiction, he also wrote numerous non-fictional works.
If the regular mold for authors is to write in one genre, then I'm going to shatter that practice. Besides writing fantasy (which I'm doing right now) and science fiction (some already written but in great need of revision), I also would like to explore espionage, mysteries, modern-day thrillers of some sort, futuristic or time travel, and perhaps historical Scottish fiction.
In terms of using a pen name for each different genre, I've read that it's the best choice if you want to be a serious author. However, my problem with that approach is that if you're purposefully masking your identity to reach a different base of fans, what will people who liked your other work do when the flow suddenly runs dry. And if you want them to know that you're working in a different genre, why use a pseudonym at all?
I agree with Lycanis that it's more about the author than what type of story they write. Just my personal taste.
