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Michael John McKean (b. 17 Oct 1947) is an American actor, comedian, writer, composer and musician, perhaps best known for his portrayal of Squiggy's friend, Leonard 'Lenny' Kosnowski, on the sitcom Laverne & Shirley and for his work in the Christopher Guest ensemble films, particularly as David St. Hubbins of Spın̈al Tap.

McKean appeared as a guest commentator on the second Current TV edition of Countdown with Keith Olbermann, discussing Bristol Palin's upcoming memoir and John McCain's claim that the Arizona wildfire was set by illegal immigrants.