Chris Jensen is the composer of the Half‑Life: Opposing Force and Half‑Life: Blue Shift music. With Gearbox, he also made the music for Counter‑Strike:Condition Zero. Chris has released numerous albums some to be available on CDBaby, Amazon, iTunes, and Rhapsody.
From his website:
Chris, originally from the Silicon Valley provides the Melodic Ambience with a Sci‑Fi twist.
Locked in a padded soundproof room through most of his childhood with only an Analog Tape Recorder and an Acoustic Piano he was slowly driven to musical madness by the thematic textures of Beethoven, Walter/Wendy Carlos and the earlier works of Jean Michel Jarre. Chris was born and
raised in the Bay Area and currently lives in Seattle. Chris is also a graphic artist and photographer who creates fantastical photo‑realistic worlds (see his Flickr gallery). Chris sometimes goes by Emo.

Website:
http://www.theworldofif.net

Flickr:
http://www.flickr.com/photos/chris_jensen