Age: 67
Occupation: Guide of the First of September Great Revolution of the Socialist People's Libyan Arab People's Republic; ruler of Libya
Previous TIME 100 Appearances: 0
The world's third-longest-serving leader, and perhaps its most theatrically dressed, Gaddafi likes traveling with a retinue of female bodyguards and a Bedouin tent. Since 2001, he has sought to improve his relations with the West by aiding the fight against al-Qaeda and ending a program of weapons of mass destruction.