He was admitted to the bar in 1901, although he then began working in social welfare and in that same year he became director of the Roumanian Relief Committee, which was organized to help Romanian immigrants. When the Committee later merged with the Industrial Removal Office, he served as the Office's manager until 1917. He was honorary secretary of the Jewish Immigrants Information Bureau early in his career, and in 1910 he was on a committee for the reform of immigration conditions at Ellis Island. In 1914, he was president of the National Conference of Jewish Social Workers. He helped organize the first national campaign of the American Jewish Relief Committee in 1915, and became the first secretary of the Joint Distribution Committee. The Committee sent him to study the Jewish conditions in Europe in 1922, and upon his return he became chairman of the National Appeal for Jewish War Sufferers. In 1924, he became chairman of the Emergency Committee for Jewish Refugees with Louis Marshall and Stephen S. Wise, and two years later he was acting chairman of the New York branch of the United Jewish Campaign. He took a second trip to Eastern Europe in 1929, after which he became national co-chairman of the Allied Jewish Campaign. In 1934, Governor Herbert H. Lehman appointed him a member of the New York State Planning Board.[3] In 1937, Lehman appointed him to the New York State Appeal Board of Unemployment Insurance.[4]