Conversation so far:
What were John O.
Brennan's career highlights?
Brennan began his CIA career as an analyst and spent 25 years with the agency.
What is notable about his time at the CIA?
He was a daily intelligence briefer for President Bill Clinton.
What did he do under President Bush?
He was director of the newly created Terrorist Threat Integration Center from 2003 to 2004.
What was his job in this position?
an office that sifted through and compiled information for President Bush's daily top secret intelligence briefings and employed the services of analysts.

Question: What else has he done in his career?
Self-contained rewrite: Other than working in the CIA and Terrorist Threat Integration Center, what else has John O. Brennan done in his career?