In this interesting article from Kotaku, Rob Kuntz relates a history of early TSR that differs somewhat from the narrative we usually hear. It delves into the relationship between Gary Gygax and Dave Arneson (D&D's co-creators) and the actual development of the game, which dates back to Arneson in 1971.
Dungeons & Deceptions: The First D&D Players Push Back On The Legend Of Gary Gygax
Everybody calls Rob Kuntz last, he says. Those who want to know about the history of Dungeons & Dragons start with co-creator Gary Gygax’s kids, one of Gygax’s biographers, or D&D publisher Wizards of the Coast. As they’re wrapping things up, they might get around to dialing up Kuntz, a...
kotaku.com