His from the Southern California Garrison division of the 501st Legion! (AWESOME)
They are posing in ARF Trooper armor with Dave Filoni, the director of The Clone Wars Animated Series, which made the world premier at San Diego 2009!
Here's a Clearer Picture:
Dr.Michael is the clone in the middle just under Dave Filoni.
Guys if you have more pictures of Comic-Con 09 which you would like to share on this Blog or any other SW/CW related items, kindly email me the images of links at: firstname.lastname@example.org