Kelly Bailey is a games composer who started the games industry career in 1998. Since then, Bailey has been working with Valve Software and NVIDIA Lightspeed Studios. Bailey's first game was Half-Life published by Valve for PC, macOS, Linux, and PlayStation 2 in 1998. After that, Kelly Bailey took part as the composer of Half-Life: Source. Later, Bailey also was part of the team who developed Portal published by Valve for PC, Android, macOS, and Linux. The latest work of Kelly Bailey was Portal: Still Alive, published in 2010.