John O. Brennan

John O. Brennan

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Director of the Central Intelligence Agency from 2013 to 2017

About John O. Brennan

John Owen Brennan is an American former intelligence officer who served as the director of the Central Intelligence Agency (CIA) from March 2013 to January 2017. He served as chief counterterrorism advisor to U.S. president Barack Obama, with the title Deputy National Security Advisor for Homeland Security and Counterterrorism, and Assistant to the President. Previously, he advised Obama on foreign policy and intelligence issues during his 2008 presidential campaign and presidential transition.

Notable works:

Undaunted

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