Some people do have email addresses that they use just for getting accounts on public boards and so on. He may rarely or never check it.
Do you have any other contact info for him?
Have you googled him?
have you used
Pipl - People Search ?
You might be able to come up with a work addy or something that he actually uses.
ARgh I just want to HELP! :-) I FEEL YOUR TENSiON