Marjorie Ellen Mahoney Dusay was an American actress known for her roles on American soap operas. She was especially known for her role as Alexandra Spaulding on Guiding Light, a role she played on and off from 1993 through the show's 2009 cancellation, as well as Jean Faircloth MacArthur, the wife of Douglas MacArthur, in the 1977 movie MacArthur.

Guiding Light is an American radio and television soap opera. Guiding Light aired on CBS for 57 years between June 30, 1952, and September 18, 2009, overlapping a 19-year broadcast on radio between January 25, 1937, and June 29, 1956. With 72 years of radio and television runs, Guiding Light is the longest-running soap opera, ahead of General Hospital, and is the fifth-longest-running program in all of broadcast history; only the American country music radio program Grand Ole Opry, the BBC religious program The Daily Service (1928), the CBS religious program Music and the Spoken Word (1929), and the Norwegian children's radio program Lørdagsbarnetimen (1924–2010) have been on the air longer.