Rasumny was born in Odessa, son of the famous cantor Ephraim Zalman (Solomon) Razumny, who was chief cantor of the choral synagogues in Kishinev, Nikolayev and Odessa.

[2] After his father's death in 1905, he moved to Saint Petersburg, where he began his theatrical career.

In 1938 in New York, he opened the Yidishe dramatishe studie (Yiddish Dramatic Studio).

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