Age: 23
Occupation: US Soldier
Previous Time 100 appearances: 0
According to Time, without Bradley Manning, you're unlikely ever to have heard of Julian Assange.
Manning allegedly leaked more than a quarter of a million classified US documents, turning WikiLeaks into a household name.
He allegedly got access to the documents while on a tour of duty in Iraq and Manning is now being held in solitary confinement, pending court martial.