Noonian Soong

Noonien Soong was one of Federation's leading cyberneticists. His best-known creation is the android Data, but he also created several other androids, including B-4, Lore, and a replica of his wife, Juliana. The Juliana replica later devorced him only a year before he perfected the emotion chip. (TNG Episode]: "[[Brothers"; Star Trek Nemesis; SNW VII: "Life's Work")