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Yatsze Mark came to Valve from San Diego where she was working at the Lightspan Partnership, doing background painting for traditional cel animation in educational games. Prior to Lightspan, she worked at Leland Interactive Media (later to become Midway Home Entertainment) after her graduation from Art Center College of Design in Pasadena. Her exceptional skill at painting is only exceeded by her questionable taste in husbands.
She held the position of texture artist, creating world and model textures for Half-Life.
- Fun 'N Games (1995)
- Half-Life (1998)
- Half-Life: Opposing Force (1999)
- The Lord of the Rings Online: Shadows of Angmar (2007)
- Dungeons and Dragons Online: Eberron Unlimited (2009)