|timeperiod=1996 – 1998http//yatsze.com Resume on Yatsze Mark's personal website
'''Yatsze Mark''' is an artist who worked as a texture artist for Valve. She is the wife of Harry Teasley, who also worked at Valve. The FilePICTURE12.png|picture of their daughter Isabel was used for the one found in Gordon Freeman's locker in ''Half-Life'', and List of minor Black Mesa employees Teasley|her name was originally to be seen in an office. Mark's List_of_minor_Black_Mesa_employees was also to appear in ''Half-Life'' as an Easter egg on a Sector C locker.
Mark graduated from the San Francisco State University in 1987, and the Pasadena Art Center College of Design in 1993.http//yatsze.com/ Resume on Yatsze Mark's personal website
After her graduation from the Art Center College of Design, she worked at Leland Interactive Media. She then worked at Lightspan Partnership in San Diego, doing background painting for traditional cel animation in educational games. She then joined Valve in 1996, which she left in 1998. She worked for Turbine from 2005 to 2006, and is currently a freelance work-for-hire illustrator who works for magazine, web, or computer game development clients, a job held since 1999.http//yatsze.com/ Resume on Yatsze Mark's personal websitehttp//web.archive.org/web/19980216132320/http//valvesoftware.com/people.htm Old Valve team list at the Valve official website
==Work for ''Half-Life''==
Mark created world and model textures for the game, including those of the Vending machine|beverage machines and the Gonarch.http//yatsze.com/portfolio-textures.html ''Half-Life'' section on Yatsze Mark's personal website
*''Half-Life Opposing Force'' (1999)
CategoryFormer Valve employees