I think Sky's still known around the forum, but Dimitry and Eber are definitely the public face on YT.
That'll change as Sky's getting more involved int the vids it seems. I'm not sure if he'll start doing all the GPU review vids or not.
But sswilson and Sagath are right, he's probably the quickest to contact via the forum (excluding Gav, but I think he's more on the hosting/site end of things and not reviews, but I might be wrong)
I think Mike is fine with not being the public face, but thats just my opinion, I've never asked him. Hes super quick to reply to emails in my experience.
As mods, we dont interact often with 'the management', and they dont lay down much in the way of ground rules for us. Gav is the exception, as when we find bugs or website problems, or want changes done, he is the go-to.
Anyways, back on topic...