Pat Harrington, Jr.
Daniel Patrick Harrington, Jr. , known as Pat Harrington, Jr. or simply Pat Harrington, was an American voice, stage, and television actor, best known for his role as building superintendent Schneider on the CBS sitcom One Day at a Time. His father, Pat Harrington, Sr., was also an actor.
Harrington was born in the New York City borough of Manhattan on August 13, 1929.
Source: Wikipedia