>>27
That was only a pseudonym; his name was Uriel Mangado Pereira, he was Spanish, though he seemed to go by Uriel M. Pereira at some point, omitting his father's surname.
Here is a request from a friend of his family, pleading in a Mozilla mailing list for information on his whereabouts:
http://www.mozdev.org/pipermail/eu/2003-July/000001.html
I sort of feel bad about trashtalking him like that; he probably had some serious issues to just flee your country, leaving your family and friends asking random strangers on the Internet for information.
Side note: I found a weird video narrated by someone with the same name, though not with any "Spanish" (misnomer, since Spain has many languages, like Basque) accent:
http://www.youtube.com/watch?v=QQPx6TCnRww