Implementer was originally the self-given name of the creators of the Infocom text adventure series Zork. Implementor, often shortened to Imp, became the title given to game designers and programmers at Infocom. Implementers were inserted as minor characters in several Infocom games. The game Beyond Zork also includes a group of characters called Implementors, minor deities who are integral to the plot. The term carried over into MUDs, particularly DikuMUDs, where it usually refers to a game's owner or owners, similarly to the term "God".
The original Zork Implementers who formed Infocom included Tim Anderson, Marc Blank, and Dave Lebling. As the company grew, the title Implementor became a badge of status. Infocom frequently promoted from within, and in particular a number of game testers, including Steve Meretzky, rose to the rank of Imp. Meretzky was publicly referred to as an Implementor, both in the "About the Author" section of the Planetfall manual and in a few issues of Infocom's customer newsletter, The New Zork Times (later renamed The Status Line).
Of special interest in the company culture was the "Implementors' Lunch", said to be "a legendary weekly event garnering all the Infocom game writers."Brian Moriarty has said his first Implementors' Lunch "was like being invited to tea at Abbey Road with the Beatles!" The Imps used an old Cornerstone package, square and blue, as a picnic basket.