Robyn Charles Miller (born August 6, 1966) is the co-founder of Cyan Worlds (originally Cyan) with brother Rand Miller. He served as co-designer of the popular computer game "Myst", which held the title of best-selling computer game from its release in 1993 until the release of "The Sims" seven years later. He also co-directed and co-lead designed the sequel to "Myst", "Riven", which was the best-selling computer game of its year of release, 1997. Miller composed and performed the soundtracks to both games. He also acted in Myst, portraying one of the antagonists, Sirrus (with brother and Cyan-cofounder Rand appearing as Achenar and Atrus). He co-wrote the first Myst novel, "The Book of Atrus".