Wizards of the Coast, originator of all things D&D that haven’t been created by D&D’s vast and imaginative modding, fanshipping and spin-off-making communities

Apparently looking up DnD on Wikipedia is too much work. Gary Gygax and TSR were responsible for the bulk of DnD’s concepts and success and Ed Greenwood created the Forgotten Realms 23 years before WotC was founded