As America's leading expert on the Presidency and an adviser to presidents from Harry S Truman to Bill Clinton, Richard E. Neustadt was ""the most penetrating analyst of power since Machiavelli,"" as Guardian of the Presidency makes clear. In this inspirational book, Neustadt's former colleagues and students celebrate the rich and diverse contributions he made to political and academic life in the United States and beyond. JFK confidant Ted Sorensen, the late historian Arthur Schlesinger Jr., Harrison Wellford, formerly of the Office of Management and Budget, and Matthew Dickinson focus on his role as a White House adviser. Newsweek's Jonathan Alter highlights Neustadt's ability to interpret the Presidency for the outside world. Fellow scholars Ernest May, Charles O. Jones, Harvey Fineberg, and Graham Allison analyze his legacy as an educator and founding director of Harvard's Institute of Politics. Anthony King (Britain at the Polls) and Eric Redman (The Dance of Legislation) discuss his work in the United Kingdom and Brazil. Former Vice President Al Gore offers an appreciation of Neustadt's influence on generations of students. The book concludes with Elizabeth Neustadt's personal reflections about her father.