Unkn0wn was born in 1993.
He joined the community back in 2007 releasing his first skin for Counter-Strike: Source.
Nowadays he is barely doing skins anymore and is rather dedicated to coding & programming.
Just a heads-up for you in case you weren't aware; your CS:GO skin installation tool seems to be broken at this time, and there have been a few complaints regarding the current state of the tool. Since the tool doesn't seem to be working, I went ahead and withheld it for the time being until you are able to get around to fixing it, Just quote and respond to the post I left on the unwithhold page for your submission once you've updated the tool with a working copy, and I will go ahead and unwithhold it.