It's become a parlor game for the chattering class: Who is ParkRidge47? TechPresident blogger David All has a great post up on his personal site that, at least for me, pretty definitively closes the door on the author being a mischief-making Republican. He tracked down an email exchange between ParkRidge47 and a person who had tried to post a video response on YouTube and had it rejected, and the language PR47 uses makes clear that this person is no friend of the GOP. Well, I have a different theory, which is that it's a professional--the language in our email exchange, and the proficiency of the technical work, makes it unlikely this is a kid. So, which professional?