Conversation so far:
When did John Owen Brennan's time as a counterterrorism advisor to Obama begin?
On February 27, 2013, the Senate Intelligence Committee postponed a vote on the confirmation of Brennan. On March 5, the Intelligence Committee approved the nomination.

Question: What led to his appointment?
Self-contained rewrite: What led to John Owen Brennan's  appointment as counterterrorism advisor for Barack obama?