M. was born in 1887 ( in Kiev - ed.) into a rich, religious family. Until age eighteen or nineteen, he learned at home, in Kiev, with his own home melamdim (religious teachers), later he took to scholarly courses. He read and studied Hebrew and Russian at first, then Yiddish literature.

In 1905 he debuted with a translation and adaptation from German in I. B. Lever's Hebrew "Hprkhim". In Yiddish he debuted in "Yidisher almanakh" (Kiev, 1909) with an article, "Notitsn fun a yidishn lezer," about Bergelson's "Arum vokzal." Later he became one of the active cultural surveyors in the field of the Yiddish school and books, and one of the important Yiddish literary critics.

Since June 1924 he has been editor of the weekly page "Literarishe bleter" in Warsaw, where he published among other articles, critiques and reviews about Yiddish theatre, actors, and dramatists.

M. was one of the initiators of the theatre section for the Kiev "Kultur-Lige (Culture League)", later in Warsaw a cofounder of David Herman's and dr. M. Weichert's studios and cofounder of the Yiddish theatrical society (Vin't").

From his great work in the field of Yiddish teatralia, there were "Peretz and the Yiddish Theatre" ("Yidish teater", Warsaw, 1927)