On Friday afternoon, Ben Bernanke will address the American Economic Association annual meeting in Philadelphia with a speech on "The Changing Federal Reserve: Past, Present, Future". It also amounts to something of a valedictory, coming less than a month before he leaves office. He will be speaking to an audience of academic economists, which of course Bernanke was before his time as a policymaker began in 2003. Here is our story from last month exploring Bernanke's legacy.