Michael John McKean is an American actor, comedian, screenwriter, composer, singer, and musician known for various roles in film and television such as Lenny Kosnowski in Laverne & Shirley, David St. Hubbins in This Is Spinal Tap, and Chuck McGill on Better Call Saul.

This Is Spinal Tap is a 1984 American mockumentary film co-written and directed by Rob Reiner. The film stars Christopher Guest, Michael McKean and Harry Shearer as members of the heavy metal band Spinal Tap, who are characterized as "one of England's loudest bands". Reiner plays Martin "Marty" Di Bergi, a documentary filmmaker who follows them on their American tour. The film satirizes the behavior and musical pretensions of rock bands and the perceived hagiographic tendencies of rock documentaries such as The Song Remains the Same (1976) and The Last Waltz (1978), and follows the similar All You Need Is Cash (1978) by the Rutles. Most of its dialogue was improvised and dozens of hours were filmed.