The Pentagon's top intelligence chief and covert war veteran Michael Vickers has quietly picked up another title: doctor of philosophy.
Vickers picked up his doctorate last Thursday at Johns Hopkins School of Advanced International Studies' graduation. It took Vickers about 17 years to earn the degree.
The former Green Beret and CIA officer who fought the Soviets in Afghanistan was working as assistant secretary of defense for special operations for much of that time, helping direct America's covert war against al-Qaida.
His dissertation, completed last summer, covers the history of revolutions over more than 4,000 years.