Sam Nunn: Sanctions Alone Won't Curb Iran's Nuclear Drivebr Chautauqua Institution - Chautauqua Institutionbr Former Georgia Senator Sam Nunn is co-chairman and chief executive officer of the Nuclear Threat Initiative, a charitable organization working to reduce the global threats from nuclear, biological and chemical weapons.He served as a United States Senator from Georgia for 24 years (1972-1996) and is retired from the law firm King & Spalding.