Ken Williams born October 30 1954 in Simi Valley, California is a retired American game developer. He co-founded Sierra Entertainment in 1979.
He wrote many programs for the Apple II computer including textbooks. He has also written many video game for Sierra as well.
Ken was the prisedent of sierra until 1996 when he sold it to CUC International he stayed with the company when in 1997 it was sold to vivendi..
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https://en.wikipedia.org/wiki/Ken_Williams_(game_developer) (info)