Joel Nielsen is a Canadian composer. Among other less known works, Nielsen has written the soundtrack for a high profile game modification (mod) for Valve's 2004 PC game epic Half‑Life 2, Black Mesa, which recreates the storyline of the original 1998 Half‑Life in the newer game's more complex, detailed and advanced engine. The mod features models and textures built from the ground up and new original music and themes by Nielsen.