Osama bin-laden
Former leader of Al-Qaeda, he coordinated strikes against the US and other countries. He was on the American FBI most wanted fugitive and most wanted terrorist list. He is solely responsible for the 9/11 bombing and went into hidings later on. In 2011, he was found by U.S special forces and killed.
Ayman Al Zawahiri
Ayman al-Zawahiri is a former member of Islamist organizations which have both orchestrated and carried out multiple attacks on the continents of North America, Asia, Africa and the Middle East. In 2012 he called on fellow Muslims to kidnap western tourists in Muslim countries. Since the September 11 attack, the U.S state department has offered a US$25 million reward for information leading to al-Zawahiri's apprehension. He assumed as leader of Al-Qaeda when Osama Bin-Laden died.