A character actor who was so convincing playing a the foreign-born Guido Panzini on The Jack Paar Show that the Immigration Service once inquired of NBC requesting his paperwork from the port of entry, Harrington is most fondly remembered for playing Schneider, the wacky building super in the 70s sitcom One Day at a Time.

He also did voiceover work for a variety of cartoons from Fritz the Cat to the inspector on The Pink Panther.