Conversation so far:
What did John O. Brennan do as an advisor to Obama?
In August 2009, Brennan criticized some Bush-administration anti-terror policies.
When did John O. Brennan begin as Counterterrorism advisor to obama?
01/20/2009
What else did John O. Brennan do while working under Obama besides criticizing anti-terror polices?
Brennan was present in the Situation Room in May 2011 when the United States conducted the military operation that killed Osama bin Laden.

Question: Did he have any notable moments under Obama?
Self-contained rewrite: Did John O. Brennan have any achievements under Obama?