Michael John McKean is an American actor, voice actor, comedian, singer, musician, composer, and screenwriter. He is best known for his roles as Leonard "Lenny" Kosnowski in the ABC sitcoms Happy Days and its spin-off Laverne & Shirley, Chuck McGill in the AMC crime drama series Better Call Saul (a spin-off of Breaking Bad), 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 1984 mockumentary film This Is Spinal Tap. He is also well-known for voicing Captain Frostymug and Lonnie the Shark in the Nickelodeon animated series SpongeBob SquarePants, and is the current voice of Grandpa Lou Pickles in the 2021 reboot series of Rugrats (replacing Joe Alaskey after his death).
For Disney, he voiced ringmaster Sarousch, the main antagonist of The Hunchback of Notre Dame II, Jasper Badun in 101 Dalmatians: The Series, Cecil in Jungle Cubs, Mr. Bream in the two-part Recess episode "Yes, Mikey, Santa Does Shave", Dr. Herder and various other characters in Dinosaurs, Lo-Fi and Mean Thumb in Teamo Supremo, Uncle Humidor in The 7D, and Robin Locks in Goldie & Bear. He also played Peter Randall in the 1997 film remake of That Darn Cat, Harvey Cooper in the 1991 Touchstone Pictures film True Identity, Philip "P.B" Barrow in Nothing to Lose, Paulie in the 1996 Hollywood Pictures film Jack, Mr. Walsh in Mystery, Alaska, and Jason Starr and Warren Starbinder in the Disney Sunday Movie telefilm Double Agent.