We've gotten several emails from people asking if we know how to get fan mail to Mary Stewart. I'm afraid I don't have a very good answer. I've never tried to write to her. Has anyone ever been successful in getting mail to her?
The only suggestion I have is to write to her c/o her publisher. Her American publisher is HarperCollins. Their contact page says that they will forward fan mail on to their authors. You should address the envelope as follows:
c/o Author mail, 7th Floor
10 East 53rd Street, New York, NY 10022
Her British publisher, Hodder, does not have any info on their website about contacting authors. They might forward mail as well, but I'm not sure. I've written emails to them a couple times about it, but haven't gotten any response.
If anyone has any other info to share, please do!