[citation needed] After high school, Carr completed a Bachelor of Arts degree in history from Macalester College before going on to work as a restaurant manager with Ground Round in the mid-1970s.

[2] In 1976, at the invitation of Gygax, he joined TSR, Inc., and wrote an introductory Dungeons & Dragons module called In Search of the Unknown in 1979.

He also edited Vault of the Drow (1978), White Plume Mountain (1979), The Village of Hommlet (1979), The World of Greyhawk (1980), The Keep on the Borderlands (1981), Descent into the Depths of the Earth (1981), Against the Giants (1981), and Deep Dwarven Delve (not printed until 1999).

[4] In the early 1980s Carr also authored three children's books which were published by TSR, including one in the Endless Quest series entitled "Robbers & Robots".

[5] "As Arneson's lawsuit loomed, TSR made a very pointed substitution to the contents of the Basic Set" by swapping in Carr's In Search of the Unknown module.

[5] Peterson wrote, "it was a good idea to target a module at beginning dungeon masters — but it also had clear implications for the legal situation.