...whoever that might be.
http://www.jkrowling.com
Warning: It's a flash site AND you have to turn off your pop-up blocker because it pops up in a new window. It works very smoothly for me, though, and remember I have dial-up. I've never gotten any pop-ups while on it, either. Very classy site and tres cool if you're easily amused by neato website stuff.
Look around and play with it, and you can actually get 4 treats from Rowling - pages, drafts and doodlings from her original work-ups of the first book.