Background
Muir was born in Andes, New York and began modeling in New York City while still a high school student.
Muir was born in Andes, New York and began modeling in New York City while still a high school student.
She participated in the Earl Carroll Vanities and in the International Review. The latter show starred Gertrude Lawrence. Her major break as a theatrical performer came when she landed the title role in My Girl Friday!, in 1929.
She befriended Wallis Warfield.
Muir is probably best known today for her appearance with the Marx Brothers in A Day At The Races (1937). Muir toured with the Marxes in a stage version where material was crafted and rehearsed prior to filming.
Muir described the Marx Brothers as diligent comic actors who sometimes worked days and weeks on a scene to perfect lieutenant Her other screen credits include parts in I"ll Take Romance (1937), City Girl (1938), and The Girl and the Gambler (1939).
She continued in motion pictures until 1942.
Her final role is Bonnie in X Marks The Spot. Her first motion picture appearance was in A Dangerous Affair in 1931.