Age: 50
Occupation: Secretary-General of Hizballah
Previous TIME 100 appearances: 0
Hassan Nasrallah, widely credited with ending the Israeli occupation of southern Lebanon, has long been a force to be reckoned with in Lebanese politics. His stance against the Special Tribunal for Lebanon, which is investigating the 2005 assassination of Prime Minister Rafiq Hariri, led to a collapse of the Lebanese government and will most likely drive the pivotal Middle Eastern nation into a prolonged state of instability. His next steps will be closely watched as Hizballah teeters between using force or politics to achieve its goals.