 Through an ongoing series of lively and informative lectures, these 'public conversations' present eminent opinion-makers, artists, authors, learned contributors to the humanities and sciences and civic and political commentators to engage the audience with topical issues facing a global and national agenda.The 2007-2008 season is highlighted by two-time Pulitzer Prize-winning historian David McCullough and prize-winning NBC Nightly News anchor Brian Williams.Past guest speakers have included former prime minister of Pakistan Benazir Bhutto; documentary filmmaker Ken Burns; Forbes CEO and former presidential candidate Steve Forbes; former U.S.