Igor Newerly lost one leg as a child. He studied law at Kiev University but he was relegated for political reasons, arrested and sent to Odessa. In 1924 he emigrated illegally to the newly independent Poland and was active in the field of pedagogy in Warsaw. He worked together with the renowned educator Janusz Korczak, and in 1926 became his secretary. From 1932 to 1939 Newerly worked for Mały Przegląd (Little Review). He married Barbara Jarecka.
After the war in 1945, he resumed a pedagogical career. Based on Newerly's novel Pamiątka z Celulozy (A Souvenir from the Cellulose Mill), the Polish director Jerzy Kawalerowicz made two films: Celuloza (Cellulose Mill) and Pod gwiazdą frygijską (Under the Phrygian Star).