American entrepreneur who set up Cyan Worlds, a gaming company that produced such well-known online games as Myst and Riven. A few of his early video gaming include Spelunx as well as the Manhole. He co-wrote many fiction books predicated on his well-known Myst gaming. He co-founded Cyan Worlds along with his sibling, Robyn Miller. He and Trend Software program founder Charles Cecil both acquired successful professions as gaming designers and style company CEOs.