Harvey Mansfield is one of the most celebrated and valued teachers in America. He is a professor of government at Harvard—and has been so since 1962. This year, some of his students and admirers held a conference called “Harvey Mansfield at 90.” With Jay, Professor Mansfield discusses some of his career-long concerns: Aristotle, Machiavelli, Tocqueville . . . He also answers, “What is democracy? Source