This is what I found on the publisher's website:
"Signed Book
I would like to have my book signed by the author. How can I get that done?
HarperCollins does not have a method of handling requests for signed copies, but you might be able to make direct contact if the author has a Web site. Look for a web site link on the author page of harpercollins.com, or put the name into a search engine such as google.com or yahoo.com to see. Alternatively, you might be able to catch your author when he's touring nearby. Go to the Authors page and see if the author's name appears in the menu under "Authors Currently Touring," select your state, and submit.
Contact an Author
How do I write to an author? Can you give me an author's e-mail address?
We are not able to release the phone number or mailing and e-mail addresses of any of our authors. However, you may be able to make direct contact with an author if he or she has a website. An e-mail address can often be found under the Contact or FAQ section on a site.
If you would like to contact an author for an interview, or other publicity/media request, please visit our Media & Publicity page. If you are looking for agent or contact information for an author that has been published by HarperCollins more than 5 years ago, please e-mail us at
AuthorContacts@harpercollins.com.
If you’d like to write to a HarperCollins author, please address your letter as follows:
FOR ADULT BOOKS:
Author Name
c/o Author Mail, 11th Floor
HarperCollins Publishers
10 East 53rd Street
New York, NY 10022
FOR CHILDREN’S AND YOUNG ADULT BOOKS:
Author Name
c/o Author Mail, 18th Floor
HarperCollins Children's Books
10 East 53rd Street
New York, NY 10022"

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Waiting On:Pauley Perrette, Peter Kay, Larry David, Sean Murray, Gary Sinise.
Most Wanted: Sean Murray, Tom , Bill Hicks, Mitch Hedberg
My autographs:
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