Robert A. Williams Jr., Regents' Professor, E. Thomas Sullivan Professor of Law and faculty co-chair of the Indigenous Peoples Law and Policy Program at the University of Arizona Rogers College of Law, delivered the John R. Coen Lecture on March 15, 2019, at 11:30 a.m. in Wittemyer Courtroom at the University of Colorado Law School. He spoke on the topic “Why Do We Need a United Nations Declaration on the Rights of Indigenous Peoples?"