Officially known as the "Assistant to the President for National Security Affairs," the National Security Advisor is the White House's resident expert on, well, national security. Perhaps counterintuitively, he/she does not head the National Security Council: that honor belongs to the Big Cheese Himself. All the Advisor does is advise the President. They are essentially viziers. Really, really smart viziers.

The current advisor, having taken office on January 26, 2005, is Stephen Hadley. Before him, we had:

http://www.whitehouse.gov/nsc/

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