Although initially conceived to be the subject of a series of prose stories (set in a post-apocalyptic Chicago), Grimjack was the street name of John Gaunt, a sword-for-hire, ex-paramilitary, war veteran and former child gladiator. He actually operates from Munden's Bar in the Pit, a slum area of Cynosure, a pan-dimensional city to which all dimensions connect. Co-created by John Ostrander and Timothy Truman, although as indicated the general premise and setting had been set before Truman came on board, the character first appeared as a backup feature in Starslayer #10 (Nov.1983) published by First Comics. Grimjack #1 was later released in August of 1984 (with the series running for 81 issues).
Following the bankruptcy of First Comics in 1991, the legal rights to Grimjack became tied up with First Comics' other assets. After 12 years of efforts, all rights to Grimjack were released and a new company was founded, with legal ownership to the character. John Ostrander and Timothy Truman are said to have "substantial equity positions" in the venture.