- Russian immigrant who transformed Yiddish theater in America as actor and producer.
- Father with actress Sarah Adler of players Jay Adler, Luther Adler, Stella Adler, Julia, Florence, Frances and Charles Adler.
- Great-grandfather of Tom Oppenheim.
- Adler's son-in-law Harold Clurman, co-founder of the Group Theater with Lee Strasberg, described Adler as "an extraordinary personality, always larger than life." His early memoir, "A Life on the Stage", was translated from the Yiddish by his granddaughter Lulla Rosenfeld and re-published in 1999 by Knopf. Includes intro by daughter Stella Adler.
- Father with stage actress Dinah Shtettin of actress Celia Adler.
- Father with stage actress Sophia Oberlander (aka Sonyz Michelson - d. 1885) of stage actor Abram Adler.
- Grandfather of Ellen Adler.
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