Michael McKean – Wikipedia

Michael John McKean (born October 17, 1947) is an American actor, comedian, and musician, known for a variety of roles played since the 1970s. McKean’s first big role was playing annoying neighbor Lenny Kosnowski on the sitcom Laverne & Shirley. In the mid-1990s he was a repertory cast member on Saturday Night Live.

https://en.wikipedia.org/wiki/Michael_McKean