John O. Brennan was sworn in as Director of the Central Intelligence Agency on March 8, 2013. Previously, he served at the White House for four years as Assistant to the President for Homeland Security and Counterterrorism. During that time, he advised President Obama on counterterrorism strategy and helped coordinate the U.S. Government’s approach to homeland security. Mr. Brennan began his service in government at the CIA, where he worked from 1980 to 2005. His assignments included Chief of Station in the Middle East and later Deputy Executive Director. He led multi-agency efforts to establish the National Counterterrorism Center, which he became interim director of in 2004.