Kohut sought to encourage Jewish scholarship in a number of ways. Through the Alexander Kohut Memorial Foundation, which he set up in 1915, he helped sponsor the publication of important works. In 1919 he presented the 8,000-volume Alexander Kohut Memorial Collection to Yale University library. His own 4,000-volume library was bequeathed to the American Jewish Historical Society, the Kohut Memorial Collection at Yale, and the Jewish Institute of Religion, where he was a trustee. He compiled the Italian index to his father's Arukh ha-Shalem, edited Semitic Studies in Memory of Alexander Kohut (1897), and published Morituri: A Reminiscence of My Father (1907). His many scholarly and popular essays reflect his interest in the prose and poetry of Hebrew, Hungarian, English, French, German, and Spanish, and in the bibliography and history of Jewish life and literature and Hebrew learning in the Americas.