 As Infinity Ward's founders Jason West and Vince Zampella started new contract negotiations to continue developing the "Call of Duty" Activision around 2007, a number of legal issues around between Infinity Ward and Activision.Ultimately, West and Zampella were forces out of Infinity Ward, later forming Respawn Entertainment within Electronic Acts.West and Zampella, as well as several Infinity Ward staff that left around the same time, filed lawsuits against Activision related to unpaid royalties and bonues.