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Ken Williams (born October 1954) is an American game programmer and co-founder with his wife Roberta Williams of On-Line Systems, which later became Sierra On-Line. Roberta and Ken married at the age of 19 and have two children. The couple have been leading figures in the development of graphical adventure games.

Their contribution to gaming was partially chronicled in the book Hackers: Heroes of the Computer Revolution. Ken was the president of Sierra until the company was sold to CUC in 1996. Vivendi currently holds the Sierra name.