Sayyid Ali Hussaini Khamenei He was previously President of Iran from 1981 to 1989. Khamenei is the second-longest serving head of state in the Middle East (after Oman's Sultan Qaboos), as well as the second-longest serving Iranian leader of the last century, after Shah Mohammed Reza Pahlavi.
Today, as Supreme Leader, Khamenei is the head of state of Iran and the commander-in-chief of its armed forces. For this reason, he is considered the most powerful political authority in the country. As Supreme Leader, Khamenei can issue decrees and make the final decisions on the main policies of the government in many fields such as economy, the environment, foreign policy, and national planning in Iran. According to Karim Sadjadpour, Khamenei has either direct or indirect control over the executive, legislative and judicial branches of government, as well as the military and media. All candidates for the Assembly of Experts, the Presidency and the Majlis (Parliament) are vetted by the Guardian Council, whose members are selected directly or indirectly by the Supreme Leader of Iran. There have been also instances when the Guardian Council reversed its ban on particular people after being ordered to do so by Khamenei.
Now he is the World Strongest Politician.
“The nuclear agreement has rocked Iran’s political establishment,” says one senior reformist politician. “Succession has become a bigger worry than before.”