He was one of the leaders of the Polish Socialist Party (P.P.S.). Over the years 1905-1907, he was linked to the illegal Yiddish periodicals of the party. He edited Dos sotsyalistishe blatt (The socialist newspaper), organ of the Jewish committee of the P.P.S. (Warsaw, 1905), and Der arbayter (The worker) (Warsaw).
Source: Y. Shatski, Yoyvl-zamlbukh lekoved 250 yor yidishe prese (Jubilee collection in honor of 250 years of the Yiddish press) (New York, 1937), p. 326.