Ulrich Weisstein is considered one the pillars of comparative literature. He has a Ph.D. in comparative literature (1954) from IU. He was one of the first to do so from the IU Comparative Literature Program. In his famous book, Comparative Literature and Literary Theory, He attempts to draw the line between different concepts like comparative, national, and world literatures. He dedicates long chapters to explain genres throughout histories as well as movements. He belongs the French school of comparative literature in which he believes that there is transference of impact between the influencer and the influenced by. In this article, Weisstein is not only a writer, but also, a historian who traces back concepts like stof, motif, genre, movement, and school. He differentiates, compares and presents his viewpoint of World Literature (WL), National Literature (NL) and Comparative Literature (CL).