Firaxis Games, Inc. is an American video game developer based in Sparks, Maryland. The company was founded in May 1996 by Sid Meier, Jeff Briggs, and Brian Reynolds following their departure from MicroProse, Meier’s earlier venture. They were acquired by Take-Two Interactive in August 2005, and subsequently became part of the publisher’s 2K label. Firaxis Games is best known for their entries in the Civilization and XCOM series, as well as many other games bearing Meier’s name.

Reference: Wikipedia