Seriously, if you think about it, technically speaking nobody but he (admins and mods excluded) could change or remove his profile information and if it was an accident or something, he would show up as some other name temporarily, just to communicate the issue and get it fixed. Which tells me that something else is wrong. Did someone make him angry or hurt his feelings in any way?
OS, if you're lurking under a different name having a good laugh, I'm going to be really embarrassed.