Michael John McKean (born October 17, 1947) is an American actor, comedian, and musician, known for a variety of roles played since the 1970s. He first came to national attention playing annoying neighbor Lenny Kosnowski on the sitcom Laverne & Shirley. In the mid-1990s he was a repertory cast member of Saturday Night Live. He has played roles in several Christopher Guest ensemble films, particularly as David St. Hubbins, lead vocalist and rhythm guitarist of the fictional rock band Spinal Tap in This Is Spinal Tap. He co-wrote the song "A Mighty Wind" (from the film of the same name), which won a Grammy Award, as well as "A Kiss at the End of the Rainbow" from the same film, which was nominated for the Academy Award for Best Song. He plays Chuck McGill, brother of the protagonist of the AMC drama Better Call Saul.