Cash, Grigoleit, Essex Wire, General Electric and Zexel Illinois, where he helped in the development of quadraphonic sound systems.

[1] In 1975, Bob Bledsaw began to run a Dungeons & Dragons campaign using the original rules, after being asked for help by Bill Owen and some other friends after trying and failing to run the game themselves four times; Bledsaw started his adventure in a fantasy campaign set in Middle-earth, but moved the campaign to a realm he designed - the City State of the Invincible Overlord - because he did not want to sacrifice the low-magic feel of Tolkien when compared to the game.

[3]: 65  Bledsaw was laid off by General Electric in 1975, so he decided to form a company to publish supplements for D&D players, and with Bill Owen he went to seek permission from TSR.

[3]: 65  Bledsaw and Owen showed their City-State material to Dave Arneson, Gary Gygax, and other TSR staff, who told them they could publish supplements to D&D if they wanted to.

[3]: 67  Bledsaw sent hundreds of pages of campaign notes to Gary Gygax in 1978, who used some of this material in the appendices of the original Dungeon Masters Guide.