Conversations in the Digital Age with Jim Zirin – Alan Greenspan served as Federal Reserve Chairman from 1987 to 2006. For many, he was the architect of American prosperity. For others, he was to blame for the 2008 financial crisis. Sebastian Mallaby, author of The Man Who Knew—The Life and Times of Alan Greenspan, tells Zirin that Greenspan failed to take action to avert the crisis.