Wizards of the Coast drafted the Open Game License used by Open Gaming Foundation and the d20 system.
Wizards of the Coast owns a number of popular game brands. Some of these are:Seattle, Washington. Their headquarters is still in nearby Renton. At Gen Con in August 1993, the company debuted Richard Garfield's Magic: The Gathering. The success of Magic generated revenue that literally carried the company out of the basement. In 1997, they bought the cash-strapped makers of Dungeons & Dragons, TSR. The game and toy giant Hasbro bought Wizards of the Coast in September 1999 and owns the company to this day.