For other uses, see Stelly (disambiguation).
Software Development Engineer
May 1997 – Present
Stelly joined Valve from Tetragon. Before that, he developed titles for PlayStation and 3DO. He's been writing games with his friend and co-worker, David Speyrer, since 1985. He studied at University of Louisiana at Lafayette, and graduated with a degree in Electrical Engineering.
Stelly worked on Half-Life as the lead systems programmer. He was responsible for the engine architecture changes, as well as the seamless level transition system, save/restore system, the physics system, water behaviors, and train enhancements. Along with Steve Bond, he built the artificial intelligence system architecture and coded the behavior for a few of creatures. He also did the technology behind the visual effects, including the beam effects, tracers, sparks, lenticular halos, decals, and fog effects. He worked on the physics engine of Half-Life 2, and was a project lead on the Xbox version of the game.
Stelly's surname appears in Half-Life as an Easter egg in the Anomalous Materials laboratory on a locker. His face is also used for the obsolete entities in the level editor, Hammer. The image uses the body of the character Fonzie (played by Henry Winkler) from the television show, Happy Days. It was created by Dhabih Eng early during the development of the Source engine.
 Selected gameography
- Half-Life (1998)
- Half-Life: Opposing Force (1999)
- Half-Life: Blue Shift (2001)
- Half-Life 2 (2004)
- Half-Life 2: Episode One (2006)
- Half-Life 2: Episode Two (2007)
- Portal (2007)
- Portal 2 (2011)
 Official biographies
- Jay Stelly - Senior Software Development Engineer
- Jay joined Valve from Tetragon where he was lead engineer and 3D engine developer of Virgin's Nanotek Warrior. Before that, he developed titles for Sony Playstation & 3DO. Way before that, he wrote his first computer game (at age 9) and had a game published in a magazine (at age 15). A native of Cajun Country, Jay finds Northwest buildings too hot (what, no air conditioning?) and the food not hot enough.
- Jay Stelly - Engine/Special Effects Developer
- Jay recently joined Valve from Tetragon where he was lead engineer and 3D engine developer of Virgin's Nanotek Warrior. Before that, he developed titles for Sony Playstation & 3DO. Way before that, he wrote his first computer game (at age 9) and had a game published in a magazine (at age 15). A native of Cajun Country, Jay finds Northwest buildings too hot (what, no air conditioning?) and the food not hot enough.
- ↑ 1.0 1.1 1.2
- ↑ Biography on Valve's official website (January 11, 1998) (archived)
- ↑ Intruder Alert document on Memphis Amiga Group
- ↑ 4.0 4.1 News archive on official Half-Life website (archived)
- ↑ Interview with Gabe Newell on Cyberactive (archived)
- ↑ Interview with Jay Stelly on Voodoo Extreme (December 17, 1998) (archived)
- ↑ Half-Life preview on ComputerAndVideoGames.com (May 28, 2003) (archived)
- ↑ Half-Life 2 (Xbox) preview on IGN (April 28, 2005) (archived)
- ↑ The mystery of the obsolete guy is solved! on TF2Maps.net (April 2, 2009)