This majestic new biography of James Madison explores the astonishing story of a man of vaunted modesty who audaciously changed the world. Among the Founding Fathers, Madison was a true genius of the early republic. Outwardly reserved, Madison was the intellectual driving force behind the Constitution and crucial to its ratification. His visionary political philosophy and rationale for the union of states-so eloquently presented in The Federalist papers-helped shape the country Americans live in today.