to read on his own. A year later, he decided to teach back home in the one room school, which had expanded to two-rooms. After his two years teaching, he married Bertha Iutzi with very little money. After marrying Bertha Iutzi, they both began attending the University of Michigan. Here he began his formal study of psychology and graduated with his bachelor's degree in 1913. After teaching in Kentucky, Hull accepted a teaching assistant position at the University of Wisconsin under Joseph Jastrow in order to join their graduate program. While taking classes and working, he privately worked on research based on the evolution of concepts, which he later applied to his dissertation, "Quantitative Aspects of the Evolution of Concepts." After graduating, he spent some time working as a half-time assistant and eventually teaching as a full-time instructor at the University of Wisconsin before moving on to Yale. Career In 1929 he began employment at Yale University, where he would serve as a Sterling Professor until his death. In addition to his other teachings, he was able to teach a psychological test and measurement course. Because he loved the mathematical portion of the course, he changed the class to aptitude testing, which focused on scientific basis of vocational guidance. On the side, Hull also conducted research to build a machine that could perform all the correlational work for him automatically. After teaching the aptitude testing class, Hull went on to teaching an introductory class for premedical students. While teaching this class he particularly took notice of suggestion and hypnosis. This was the starting point of his experimental testing in this field in which Hull focused on the quantitative methodology in experimental psychology. After ten years of in-depth research, he wrote the book Hypnosis and Suggestibility in 1933. After writing the book, he decided to continue in experimental field by teaching this course in addition to the premedical course. Hull had a great desire to teach this course and felt as though this specific type of science was the foundation of true psychology. In 1929 he was called to the Institute of Psychology at Yale University as a research professor of psychology where he worked on the problems concerning systematic behavior theory. In 1930, he came to several conclusions about psychology: the first was that he believed that psychology is a true natural science. The second was that its primary laws