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:
Wizards of the Coast was founded by Peter D. Adkison in 1990 just outside 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.