From 1937 to 1952 he served as a professor of English at Columbia University, where he was a popular lecturer. In 1955, Krutch won the National Book Award for The Measure of Man (1954). In that work, he partially retreated from the gloomy pessimism of his early years and argued that there are aspects of human beings, such as reason, consciousness, free will, and moral judgment, that cannot be explained by mechanistic, deterministic science.[1]:321–326