Note: please do not send a carrier pigeon.
He is happy to answer any questions you might have about something he’s written. Unfortunately he cannot read your fan-fiction, unpublished novels or short stories. No, not even if you ask him nicely. He also cannot give you writing advice, put you in touch with his editors or introduce you to another author.
If you’re looking to get in touch regarding rights enquiries, offers of work, or some other professional capacity, feel free to contact him via any of the methods above.