Besides Unreal and Deus Ex, he also worked on Tyrian, Jazz Jackrabbit 2, Thief: Deadly Shadows, Neverwinter Nights 2, Dust: An Elysian Tail, Alpha Protocol, and Torment: Tides of Numenera.
I'm currently working with Retro Studios here in Austin. As much as I'd like to say more (except the work is incredibly exciting and the team is awesome), I can't.
Unreal Tournament OST
Deus Ex OST
EDIT: L~A took a screencap of the post.
By the way, Alexander Brandon is a huge Metroid fan: http://www.vgmpf.com/Wiki/index.php/Alexander_Brandon
He interviewed Hip Tanaka, the composer of the original Metroid, in 2002: http://www.gamasutra.com/view/featur...he_hip_an_.php
A friend later showed him Metroid and he was fascinated by the music, which is why he went into game music.
Doesn't mean he is working on Metroid, but still interesting.