Kotick instituted a full rework of the company to cover its debts: dismissing most of its staff, moving the company to Los Angeles, and reverting to the Activision name. Building on existing assets, the Kotick-led Activision pursued more publishing opportunities and, after recovering from the former debt, started acquiring numerous studios and intellectual properties over the 1990s and 2000s, among these being the "Call of Duty" and "Guitar Hero" series. A holding company was formed as Activision's parent company to manage the internal and acquired studios. In 2008, this holding company merged with Vivendi Games (the parent company of Blizzard Entertainment) and formed Activision Blizzard, with Kotick as its CEO. Within this structure, Activision serves to manage numerous third-party studios and publish all of the parent company's games outside of those created by Blizzard.