 Brennan became deputy executive director of the CIA in March 2001.He was director of the newly created Terrorist Threat Integration Center from 2003 to 2004, an office that sifted through and compiled information for President Bush's daily top secret intelligence briefings and employed the services of analysts from a dozen U.S. agencies and entities.Brennan then left government service for a few years, becoming Chairman of the Intelligence and National Security Alliance (INSA) and the CEO of The Analysis Corporation (TAC).