Robyn Charles Miller (born August 6, 1966, in Dallas, Texas) co-founded Cyan Worlds (originally Cyan) with brother Rand Miller. After releasing a number of children's adventure "worlds," the brothers finally hit on a success with the computer game Myst, which remained the number one-selling game for the remainder of the 1990s. The brothers also acted out parts in the game, with Robyn as Sirrus and Rand as Achenar and Atrus.