King Digital Entertainment, also known as King.com, is a social games company, and the largest game developer ever in the history of the website Facebook.com. King develops games for the web, for mobile (iOS, Android, Windows Phone), Facebook, and Windows 10. King is led by Riccardo Zacconi, who has served in that role since co-founding the company in 2003. Founding partner Melvyn Morris serves as chairman. The company has 1400 employees and parcels development out to small, autonomous teams of designers working with a "startup" mentality. In 2013, it spent $110.5 million on research and development, roughly 6 percent of sales.