Sigmund Mogulesko — Yiddish: זעליק מאָגולעסקאָ Zelik Mogulesko, first name also sometimes spelled as Zigmund, Siegmund, Zelig, or Selig, last name sometimes spelled Mogulescu — was a singer, actor, and composer in the Yiddish theater in New York City. He was born in Kalarash, Bessarabia and began singing in the local synagogue choir. Before reaching adolescence, he was paid nearly three times what teachers made, to sing in the synagogue of Chişinău. Soon after moving to Bucharest, Romania, he was paid to sing in churches as well as synagogues, and started acting.

David Kessler (1860–1920) was a prominent actor in the first great era of Yiddish theater. As a star Yiddish dramatic performer in New York City, he was the first leading man in Yiddish theater to dispense with incidental music.