The Creative Assembly Limited (trade name: Creative Assembly) is a British video game developer based in Horsham, founded in 1987 by Tim Ansell. In its early years, the company worked on porting games to MS-DOS from Amiga and ZX Spectrum platforms, later working with Electronic Arts to produce a variety of games under the EA Sports brand. In 1999, the company had sufficient resources to attempt a new and original project, proceeding to develop the strategy computer game Shogun: Total War which was a critical and commercial hit, and is regarded as a benchmark strategy game. Subsequent titles in the Total War series were built following the success of Shogun: Total War, increasing the company’s critical and commercial success.

In March 2005, Creative Assembly was acquired by Sega and became part of Sega Europe. An Australian branch was operated from Fortitude Valley, Queensland as Sega Studios Australia. Under Sega, further Total War titles were developed, and Creative Assembly entered the console market with action-adventure games such as Spartan: Total Warrior, Viking: Battle for Asgard and Alien: Isolation.

Reference: Wikipedia