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Kelly Bailey is a composer, conceptual artist and was Valve's senior audio producer, responsible for creating sound effects and music for the Half-Life video game series as well as Portal in 2007.

Half-Life 2's Gordon Freeman's face was based on him, among other Valve employees, such as David Speyrer, Eric Kirchmer and Greg Coomer.

His name appears in Half-Life as an Easter egg on a Sector C locker and can be heard in announcements.

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