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Robert Peter Williams, known professionally as Robert Guillaume, was an American actor, director, producer, singer, voice artist, and comedian, best known for his role as Isaac Jaffe in Sports Night and Benson in Soap and its spin-off series Benson. He also voiced Dr. Eli Vance in the video game Half-Life 2 and it's episodes.

For Disney, he performed the voice of Rafiki in The Lion King and reprised the role in subsequent projects. In 1996, he portrayed Wilkes in First Kid and Agent Steve Bishop in Spy Hard. He also voiced Dr. Vincent Parker in The Proud Family, Ben in The Adventures of Tom Thumb and Thumbelina, and Mr. Thicknose in The Land before Time VIII: The Big Freeze.

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