The Chairman of the Federal Reserve is America's banker. Would you like to see your interest rates go down? Do you wish there were more money in circulation? Do you want change for a dollar? Take it up with the Fed Chair.
Bernanke took the position of Fed Chair after it was vacated by Alan Greenspan, who had finally decided that being the most famous economist - Ever - wasn't going to get any better, and that his personal economy wasn't going to expand any more in that position.