Sofia Ezarovna Shatsova Helfand (née Russian: Софья Евзаровна Шацова;[1] December 9, 1902 – May 19, 1995), known as Sonia Moore, was a Russian-born American actress, writer and acting teacher.

[3] Moore was born in Gomel, Russian Empire (now Belarus) in 1902, into a Jewish family.

In 1940, she and her husband defected from his posting in Italy to the United States, fearing Stalin's purges if he were to return to Moscow.

[4][1] After her husband's death in 1957, Sonia decided to open a school of acting to bring the up-dated and revised teachings of Stanislavski in America.

in 1961, she founded the Sonia Moore Studio of the Theatre in New York City.