I was respecting privacy, but on second thought I don't think he would mind.  His name is Gregor Volkmann and his site is at http://gregor.volkmann.me/ .  He contacted me by email so I don't have a username, and I couldn't find one with search.  I haven't heard from him since telling him I posted, so I guess he hasn't registered.  He probably only would have posted the link, but looking at his home page he seems open to being contacted, if people have questions or whatnot.