TSR (Tactical Studies Rules) was the original publisher of Dungeons & Dragons. The company was founded by Gary Gygax and Don Kaye in 1973 in order to self-publish Dungeons & Dragons, which was finally released in 1974. The original Dungeons & Dragons game was revised into Basic Dungeons & Dragons and Advanced Dungeons & Dragons 1st edition in 1977. Gary Gygax lost control of the company in 1985, and Lorraine Williams took over at the beginning of 1986. TSR continued to oversee the game into the Advanced Dungeons & Dragons 2nd edition era, until it was finally bought by Wizards of the Coast in 1997.

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