Came to the United States, 1888. Bachelor of Arts, College City of New York, 1895. Fellow in Semitics, Columbia, 1900.
Doctor of Philosophy, 1902.
Doctor Hebrew Law, Hebrew Union College, 1937. Doctor Hebrew Letters, Dropsie College, 1937.
His magnum opus was the four volume Otsar ha-shirah veha-piyut = Thesaurus of Mediaeval Hebrew Poetry (New York, 1924–1933). Davidson studied in yeshivas in Jonava, Volozhin, and Slobodka. In 1898, he emigrated to New York, worked at a few occupations before earning a Doctor of Philosophy from Columbia University.
Married Carrie Dreyfuss, September 3, 1906. Children: Gladys, Jessica.