The thesis has as its main hypothesis the importance of American legal realism to the development of American Law Schools and legal education. In order to accomplish that, three authors will be faced: Wesley N. Hohfeld, Walter W. Cook e Karl N. Llewellyn. The first chapter will bring an introduction about the methodological issues of the present work. The second chapter will make a historical digression on the American law so that the reader can understand in which context American legal realism appeared. The third chapter will be about Wesley N. Hohfeld and his importance to the appearance of American legal realism and also his contribution to legal education. The fourth chapter will treat Walter W. Cook’s theory and his failure in the John’s Hopkins Institute. The fifth chapter will treat specifically about the appearance of the legal realism movement through Karl N. Llewellyn articles and his law-jobs theory. Also, his criticism about legal education at the time will be the core of this chapter. The sixth chapter will demonstrate why American legal realism was not successful in its attempt and why it didn’t last long. It also will demonstrate the important legacy left by the movement. Finally, the conclusion will demonstrate the thesis’s limitations and its main contributions.