[10] After touring the country in Blossom Time, she was cast as Grusinskaia in the Broadway adaptation of Vicki Baum's novel Grand Hotel.

[10] After Grand Hotel, Leontovich was given the role of Lily Garland (aka Mildred Plotka) in Twentieth Century, a comedy by Ben Hecht and Charles MacArthur.

[11] She also played the Archduchess Tatiana in Tovarich, a comedy about a pair of Russian aristocrats who survive in Paris by going into domestic service.

During World War II, she appeared on Broadway in Dark Eyes, a comedy she wrote with Elena Miramova about three Russian exiles in New York.

[4] Leontovich, whose students addressed her and referred to her as "Madame", lived in a Manhattan apartment surrounded by family pictures and icons.

[5] Leontovich made her Broadway debut in 1922 in Revue Russe, appearing with Gregory Ratoff, whom she married the following year.

[11] She appeared in a handful of films: Four Sons (1940), The Men in Her Life (1941), Anything Can Happen (1952), The World in His Arms (1952), The Rains of Ranchipur (1955) and Homicidal (1961).

She also appeared in two episodes of the television series Naked City, once opposite Viveca Lindfors, her former Anastasia co-star and a personal friend.