Day, Clarence Shepard, 1874–1935, American essayist, b. New York City, grad. Yale, 1896. His biographical sketches of his parents, God and My Father (1932), Life with Father (1935), and Life with Mother (1937), won him popular recognition; incidents from these three books were used by Howard Lindsay and Russel Crouse for the play Life with Father (1939), which was one of the longest-running plays in Broadway history. Day's other works include essays, This Simian World (1920), and a collection of light verse and drawings, Scenes from the Mesozoic (1935).