Sebastian Mallaby's magisterial biography of Alan Greenspan, the product of over five years of research based on untrammeled access to his subject and his closest professional and personal intimates, brings into vivid focus the mysterious point where the government and the economy meet. To understand Greenspan's story is to see the economic and political landscape of the last 30 years—and the presidency from Reagan to George W. Bush—in a whole new light. As the most influential economic statesman of his age, Greenspan spent a lifetime grappling with a momentous shift: the transformation of finance from the fixed and regulated system of the post-war era to the free-for-all of the past quarter century. The story of Greenspan is also the story of the making of modern finance, for good and for ill.

Greenspan's life is a quintessential American success story: raised by a single mother in the Jewish émigré community of Washington Heights, he was a math prodigy who found a niche as a stats-crunching consultant. A master at explaining the economic weather to captains of industry, he translated that skill into advising Richard Nixon in his 1968 campaign. This led to a perch on the White House Council of Economic Advisers, and then to a dazzling array of business and government roles, from which the path to the Fed was relatively clear. A fire-breathing libertarian and disciple of Ayn Rand in his youth who once called the Fed's creation a historic mistake, Mallaby shows how Greenspan reinvented himself as a pragmatist once in power. In his analysis, and in his core mission of keeping inflation in check, he was a maestro indeed, and hailed as such. At his retirement in 2006, he was lauded as the age's necessary man, the veritable God in the machine, the global economy's avatar. His memoirs sold for record sums to publishers around the world.