Howard can be reached at his official email address, email@example.com. Posting comments here or on any of the many Schlock communities is not a guaranteed way to reach him, though it’s possible you will. Please read the FAQ before emailing, because it's possible your question or request has already been answered, granted, or the matter otherwise cleared up.
You can also snail mail things to:
PO Box 385
Orem, Utah 84059