Which composer is credited on Portal alongside Mike Morasky?

Kelly Bailey is the composer credited on Portal alongside Mike Morasky.

Bailey was a major part of Valve’s audio identity before and around Portal’s release. He created the music and sound effects for Half-Life and continued contributing to Valve projects, bringing an industrial, atmospheric style that fits the company’s science-fiction worlds. Mike Morasky, another Valve composer and musician, shared the Portal composition credit.

Portal’s audio is especially memorable because music, sound design, and voice performance work together. The portal gun’s effects, the sterile test-chamber ambience, GLaDOS’s processed voice, and the end-credit song all help make the short game feel like a larger world. Jonathan Coulton wrote and performed “Still Alive,” but he was not the composer credited alongside Morasky for the game’s score.

That distinction causes the most common mix-up. Coulton is strongly associated with Portal because of “Still Alive,” while Bailey is the credited Valve composer paired with Morasky. Bailey is also known for his work on the Half-Life series and later Valve audio projects.