A Texas based developer of computer games founded, in 1996, by John Romero, Tom Hall, Todd Porter, and Jerry O'Flaherty.
In late 1997, Warren Spector was asked to found the Austin branch of Ion Storm. By keeping well clear of the troubles at the Dallas office, Ion Storm (Austin) was more successful. It developed the highly successful and critically acclaimed Deus Ex. With the demise of Looking Glass Studios, Eidos Interactive secured the rights to the Thief franchise and together with Spector tried to relocate as many of the Looking Glass team to Austin as was possible. After the closure of the Dallas office, the Austin office remained open to produce Deus Ex: Invisible War and Thief: Deadly Shadows until Spector's departure to "pursue personal interests outside the company" in 2004. A number of other senior staff also left at about the same time. On February 9, 2005, Eidos announced that the Austin office would also close, meaning the end of Ion Storm as a company.