John O. Brennan was one of President Obama's most trusted national security advisors during all eight years of the Obama Administration, first as assistant to the president for homeland security and counterterrorism and then as director of the Central Intelligence Agency. Mr. Brennan had previously worked in the CIA from 1980 to 2005, where he specialized in Middle Eastern affairs and counterterrorism and served as President Clinton's daily intelligence briefer. Mr. Brennan received a bachelor's degree in political science from Fordham University in 1977 and a master's degree in government from the University of Texas at Austin in 1980.