2008 - Intelligence adviser to then-Sen. Barack Obama during his presidential campaign.
January 20, 2009-present - Assistant to President Barack Obama for Homeland Security and Counterterrorism.
January 7, 2013 - Nominated by President Barack Obama to be director of the CIA.
February 7, 2013 - Testifies before the Senate Intelligence Committee as part of his confirmation hearings.
March 7, 2013 - Confirmed by the Senate, 63-44.
March 8, 2013 - Brennan sworn in as director.