Sofia Ezarovna Shatsova Helfand (''née'' ; December 9, 1902 – May 19, 1995), known as Sonia Moore, was a Russian Empire-born American actress, writer and acting teacher. She is known for simplifying Stanislavski's system of acting devised by Konstantin Stanislavski. Moore was a student of Yevgeny Vakhtangov, and later became an acting teacher.
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