If you mean this Wiki, the Community Central, no-one. Even if was known, it would be of no use to anyone as it's likely they are either long inactive or have since deleted their account. People such as Tupka are here to help you, not the founder.
One of the staff said it somewhere, it might have been on Angela's talk page, but I'm not really sure. When CC was founded there was no Special:CreateNewWiki so staff would have to create it manually. If I remember, it was one of the original engineers of FANDOM, don't quote me on that! But no one has a founder label on their profile.