- Daughter of actor Frank Gillmore.
- Trained at the American Academy of Dramatic Arts.
- Began on stage in the 1917 play "A Scrap of Paper". She retired after appearing on Broadway in "Sail Away.".
- Generally associated with the productions of the Theater Guild.
- Niece of actor/writer George Thorne.
- Gillmore was better known for decades as a Broadway star. Among her most ardent admirers was Jacqueline Susann. According to Susann's biography, Susann had an unrequited but passionate crush on Margalo.
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