Michael McKean
Michael John McKean (born October 17, 1947) is an American actor, comedian, writer, composer and musician well 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, the lead vocalist and rhythm guitarist of the fictional rock band Spinal Tap from the eponymous film.