The brightest minds in politics, technology, academia and economics are among those in Aspen this week for the annual Ideas Festival.

As always, it’s an eclectic lineup of speakers. This year’s roster ranges from Republican Mississippi Gov. Haley Barbour to Evan Williams, a co-founder of Twitter. There will also be two Supreme Court justices on hand — Justice Stephen Breyer and former Justice Sandra Day O’Connor.

The festival lasts through July 3. Many of this year’s discussions will consider the decade since the Sept. 11 attacks and now the nation has changed.