Wisconsin-born actor, writer, director, and producer. Most famous for his staring role in Robocop, but geeks everywhere know him as Buckaroo Banzai.
Other note-worthy performances include the film adaptation of Naked Lunch, and his role on the television series Odyssey 5.
Has something of a freakish appearance and voice, sort of a cross between utterly boring and (As StrawberryFrog points out) eerily plastic. Gave me the willies as a child when I saw him in The Abyss.