Irrational Games was founded in 1997 by Ken Levine, Jonathan Chey and Robert Fernier whom previously worked at Looking Glass Studios.
Irrational is credited with the following:
System Shock 2 (1999)
Freedom Force (2002)
Tribes: Vengeance (2004)
Freedom Force vs the 3rd Reich (2005)
SWAT 4 (2005)
BioShock Infinite (2013)