Timothy Busfield is an American actor and director. He played Arnold Poindexter in the first two Revenge of the Nerds films, Elliot Weston on the television series Thirtysomething, Mark in Field of Dreams, and Danny Concannon on the television series The West Wing. In 1991, he received a Primetime Emmy Award for Outstanding Supporting Actor in a Drama Series for Thirtysomething.

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