What did the IAEA know about Iran’s nuclear program before 2026 U.S.-Israeli strikes? Rafael Grossi has served as the director general of the International Atomic Energy Agency, the United Nations’ nuclear watchdog, since 2019. Prior to that, Grossi held various positions related to nuclear safety and the non-proliferation of nuclear weapons. A veteran diplomat, he was also Argentina’s ambassador to Austria and the Argentine Representative to the IAEA and other international organizations.