kwebtv:

Daniel Patrick Harrington, Jr., (August 13, 1929 – January 6, 2016), known as Pat Harrington, Jr. or simply Pat Harrington, a voice, stage, and television actor, best known for his role as building superintendent “Schneider” on the CBS sitcom One Day at a Time.

Harrington became famous in the 1950s as a member of Steve Allen’s television comedy troupe, the “Men on the Street” (which also included Don Knotts, Tom Poston and Louis Nye). Harrington also gained considerable recognition for his many appearances as the comedic Italian immigrant “Guido Panzini” on The Jack Paar Show in the mid-1950s. In the 1959-1960 season, he played the recurring role of Pat Hannigan in eleven episodes of Danny Thomas’s CBS sitcom, Make Room for Daddy.
Hannigan is the pending son-in-law of Thomas’ character of Danny
Williams; he is engaged to older daughter Terry Williams, played by
Penny Parker after Sherry Jackson, who originally filled the role, vacated the series in 1958. Just a few weeks before Harrington’s passing, Marjorie Lord, another alumnus of The Danny Thomas Show who played Thomas’ second wife in the series, died on November 28, 2015.

In the 1964–1965 television season, he guest-starred on numerous programs, including ABC’s sitcom The Bing Crosby Show and NBC’s Kentucky Jones (starring Dennis Weaver). In a 1965 episode of The Man from U.N.C.L.E. (“The Bow-Wow Affair”), Harrington reprised his role as “Guido Panzini” (who he also played in the February 8, 1966 episode of McHale’s Navy and in the May 2, 1983 episode of One Day At A Time). (Wikipedia)

IMDb listing.