Sierra On-Line

Updated: 01/31/2019 by Computer Hope
Sierra Entertainment logo

Founded in 1979 by Ken Williams and Roberta Williams as On-Line Systems, Sierra On-Line is an American video-game developer and publisher. On-Line Systems became Sierra On-Line in 1980, and moved its headquarters from Los Angeles, California, USA to the Sierra foothill community of Oakhurst, California. The company is presently owned by Activision, a subsidiary of Activision Blizzard.

Contact information

Support: (310) 255-2050
Fax: Unknown
TDD/TTY: Unknown
FTP: Unknown
E-mail: Sierra contact page
Address: Sierra On-Line
7100 W. Center Road
Suite 301
Omaha, NE 68106
Stock: ATVI (Activision Blizzard, Inc.)

Companies selling similar products

Related pages on Computer Hope

Company news

August 7, 2014 - The Sierra website comes back online.

2008 - Activision announces Sierra is closed and up for sale.

October 2007 - Releases Timeshift.

September 2007 - Releases World in Conflict.

2005 - Sierra Entertainment integrates other companies including High Moon Studios, Massive Entertainment, Radical Entertainment, and Swordfish Studios into its division.

February 19, 2002 - Sierra changes its name to Sierra Entertainment.

March 19, 2001 - Tribes 2 goes gold.

June 2000 - Sierra becomes part of Vivendi Universal.

1988 - Sierra Entertainment's Kings Quest IV becomes first game to support AdLib.

1979 - Sierra is founded.