After 12 years as the International Atomic Energy Agency's chief, Mohammed El Baradei is leaving the UN organisation.
From his first major challenge after taking office - investigating into whether Saddam Hussein, the former president of Iraq, had a nuclear programme or not - to more recent moves to take on Iran's controversial nuclear programme, the jury is out on whether El Baradei has made the world a safer place.
Mohammed Vall reports on the battles faced by the nobel peace prize-winning chief during his time in office.
