Kesmai was a pioneering game developer and online game publisher, founded in 1981 by Kelton Flinn and John Taylor. The company was best known for the combat flight sim Air Warrior on the GEnie online service, one of the first graphical MMOGs, launched in 1987. They also developed an ASCII-based MUD, Island of Kesmai, which ran on CompuServe.
The company was acquired by Rupert Murdoch's News Corp. in 1994. The company continued to develop massively multiplayer games such as Air Warrior 2 and Legends of Kesmai. They distributed their games through AOL and eventually a new gaming service formed with three other publishers, GameStorm.
Source: Wikipedia, "Kesmai," available under the CC-BY-SA License.