Hull, Clark Leonard (1884-1952), was an American psychologist known for his research on the learning process and for his mathematical approach to the study of behavior. Hull believed that human behavior could be studied using scientific methods. His major work was a mathematical theory of learning. This theory emphasized the interrelationship of learning, which Hull called habit, and motivation, which he called drive.
Hull was born on May 24, 1884, near Akron, N.Y. He graduated from the University of Michigan in 1913 and received a Ph.D. from the University of Wisconsin in 1918. In 1929, he joined the faculty of Yale University. He died on May 10, 1952.
