A. Leon Green (March 31, 1888 – June 15, 1979) was an American legal realist, a pioneer in Tort law, nationally known writer and scholar, and dean of Northwestern University School of Law for 38 years.[1][2] Through his efforts, Northwestern had one of the strongest law schools in the United States during the 1930s and the 1940s.[2] He also served as professor at Yale Law School and the University of Texas School of Law.[1] Green wrote the "groundbreaking book, The Rationale of Proximate Cause, in 1927.[3]