At age 20, she moved to the United States at the invitation of William Morris to appear in Barnyard Romeo, a show she had performed in Vienna.
"[2] Because her surname was difficult for American audiences, she went by the single name "Mitzi" in programs and publicity materials at the peak of her career.
[3] Broadway shows she appeared in included La Belle Paree (1911), Her Little Highness (1913),[4] Sari (1914, 1930),[5] Pom-pom (1916), Head over Heels (1918),[6] Lady Billy (1920-1921),[7] The Magic Ring (1923), Naughty Riquette (1926), The Madcap (1928),[8] You Can't Take It With You (1936-1938),[9] Mr. Big (1941), and Cafe Crown (1942).
[16] In midlife, when roles became scarce and her husband was ill, Hajos worked as a secretary for The Shubert Organization.
[17] Mitzi Hajos was married to her frequent co-star Boyd Marshall from 1920[18] until he died in 1950.