Marcus Skyler was a joint pseudonym used by developers Arinn Dembo and Martin Cirulis in a series of narrative design projects for publisher Sierra OnLine. Games in this series included Homeworld, Homeworld: Cataclysm, Ground Contol, and Arcanum: of Steamworks and Magick Obscura.
According to the former writing partners, Cirulis primarily took responsibility for character design, mission design and campaign scripts, while Dembo was more often responsible for background fiction, setting, and faction design details. The pseudonym was abandoned in 2004, and the two have been credited separately since that time.