Prior to joining the Chase Center, Green was Professor of Law and Jamie L. Whitten Chair in Law and Government at the University of Mississippi School of Law where he has taught for the past 19 years. He has been visiting faculty at Princeton and the University of San Diego. 

A leading constitutional law scholar, his research is primarily in the Fourteenth Amendment and constitutional theory, and he has been cited four times in opinions by justices of the U.S. Supreme Court.