Greg's a friend of mine, a veteran game designer with titles on every platform (table, PC, console, PDA, cell), super smart about the theory and practice of creating games, and most famous for a rant at the last GDC about "burning down the game industry"-- expanded and published in the Escapist here.
His shout-out to SL developers here.
As he mentions there, he's curious about coming into SL to see the latest and best of game development in SL. Hopefully I can bring him back in-- if you're interested in showing him your game stuff, post here or IM me.