Ken Williams and Roberta Williams are the founders of Sierra On-Line and creators of commercially successful graphic adventures. He was the CEO of Sierra On-Line from 1979 to 1996. He went into retirement in 1996 after selling off his company to CUC International. At present, he lives in Mexico but travels extensively with his wife and maintains a couple of websites as hobbies.
In an ACG interview conducted in 2006, Williams dismissed any chance of returning to the computer game business, "The honest answer is that I am retired. My primary focus is on boating around the world, and trimming a few strokes off my golf game. As a hobby I’ll keep doing talkspot.com, but realistically, it’s really only myself VERY part time, my son DJ and a great programmer (Brian) working on the project."
- Mystery House (designer: Roberta Williams, implementor: Ken Williams, publisher: Sierra; 1980). See also: Mystery House Taken Over.
- Ulysses and the Golden Fleece (with Bob Davis; publisher: Sierra; 1982). Former commercial game.