According to Misha Boodkin, he was the actor Moshe Finkel's brother. F. was a Broder singer, which used to sing in the wine cellars. He had a Christian wife, who converted and used to bless the candles. They used to call him for weddings and brisses, and although he did not go on the straight path, the rabbi Granovsky used to be his guest. K. joined the theatre as an actor, early on manager of the theatrical laboratory.

In this theatre K. participated in the first production as "Lamternishiser" in Sholem Aleichem's "Agentn (Agents)." Later as "comic" in "Kolduyna." "Kalton" in "200,000," "director" in "Dos tentn gebot (The Tenth Commandment)," and "The rabbi" in "Di dray pintelekh." In 1928 K. crossed over in the Kharkov Yiddish State Theate as an actor and social, political activist.