There are many, many Kens out there, and a shocking number of them have the last name of Foster. That's why my email address has an R between the Ken and the Foster. All email without the R goes to someone else entirely, and apparently he's been getting a lot of it.
I finally contacted him last night after my friend Susan said, "Did you get my friend's email? She loved your book."
So the other Ken is going to try to forward stray mail from now on (Thank you Ken!). Meanwhile, if you are wondering why you haven't heard back from me, it may be because I'm really busy. Or it may be because your email ended up with the wrong Ken.