Rafael Mariano Grossi will meet with senior Iranian officials in Tehran VIENNA: The head of the Vienna-based International Atomic Energy Agency, the UN nuclear watchdog, will travel to Iran on Saturday in order to meet officials there, the IAEA said Thursday. “Director General Rafael Mariano Grossi will travel to Tehran for meetings with senior Iranian officials on Saturday,” an IAEA spokesman said in a statement, adding that Grossi would hold a press conference on his return to Vienna on Saturday evening.