[2] Slonim immigrated to America when he was two, initially living in Chicago before moving to New York City.
[3] Slonim's poems debuted in Philadelphia's Di Idishe Velt, after which he published poetry in a variety of periodicals, mainly based in New York.
His poems appeared in Morris Bassin's 1917 anthology Finf Hundert Yor Yidishe Poezye and Nachman Meisel's 1955 collection Amerike in Yidishn Vort.
[5] He covered police headquarters, the courts, City Hall, and was on a first name basis with the judges and racket bosses.
He worked with Tammany Hall to make sure Der Tog's endorsement of Democratic candidates was rewarded with a generous number of paid municipal notices.
[6] Chief political reporter of the paper for 25 years, he covered Albany for the paper during the gubernatorial administrations of Smith, Roosevelt, and Lehman and established a friendly relationship with all three of them, Wendell Willkie, and Louis Brandeis.