Andrew Ricci, winner of US Nationals 2012
Here's him at the Finals:
Gpw5JWPFdVk
Interview begins at 2:30
Solve 4 begins at 0:47
6.15 sec single solve: New North American Record and 4th best in the world
(would've been 3rd best if Yumu Tabuchi hadn't just gotten a 6.09 sec single...