What about talking directly to the employee about it? Remind him of why he's been promoted and how much you need him, and that his giving one week leaves you in the lurch. Tell him you'd like him to put the start of the new place another week out. The worse that'll happen is he says no, but you've gotten your point across. If he's been great 99% of the time that's probably his true character. Get pissed but no need to get even.
6/13/13 at 4:23pm