Khaled Hosseini address

[RBD girl]

Hey, guys! I've been looking for Mr Hosseini's address for so long, but I wasn't successful.
He is the writer of "The Kite Runner" and "A Thousand Splendid Suns". There are several addresses on his official website, but there isn't a one on which people can contact him. I'd also tried sending an email to Elaine Koster Literary Agency and asking for an address, but I never got a reply. ( http://www.khaledhosseini.com/hosseini-contact.html )
Can somebody, please, help me? Should I send my letter for him on the address of that agency?
Thanks a lot!
Regards!

Jovana