She has appeared on stage in Broadway theatre, notably as Norma Desmond in Sunset Boulevard, and is a multiple award-winning cabaret performer.
[1] Mason started as a "singing hostess at Lawrence of Oregano in Chicago" in 1976 after leaving college, where she met the late pianist and composer Brian Lasser, with whom she worked until his death in 1992.
[6] She continues to perform her cabaret act at such venues as Davenport's (Chicago)[7] and The Iridium (New York City).
[17] Mason appeared on tour in Andrew Lloyd Webber's Love Never Dies as Madame Giry.
In December 2020, Mason appeared in The Doris Dear Christmas Special on Broadway on Demand, where her performance received a 5-star rating.