Karl Llewellyn was an influential American legal scholar and a key figure in the development of the Legal Realism movement in the early 20th century. Born in 1893, he emphasized the importance of understanding law in practice rather than just through abstract rules. Llewellyn believed that law should reflect the realities of social life and human behavior. He served as a professor at Columbia Law School and was instrumental in shaping modern legal thought. Llewellyn's work, including his writings on the Uniform Commercial Code, helped bridge the gap between legal theory and practical application, making significant contributions to the field of law.