Who controls what is taught in American universities – professors or politicians? The answer is far from clear but suddenly urgent. Unprecedented efforts are now underway to restrict what ideas can be promoted and discussed in university classrooms. Professors at public universities have long assumed that their freedom to teach is unassailable and that there were firm constitutional protections shielding them from political interventions. Those assumptions might always have been more hopeful than sound. A battle over the control of the university classroom is now brewing, and the courts will be called upon to establish clearer guidelines as to what – if any – limits legislatures might have in dictating what is taught in public universities. In this path-breaking book, Keith Whittington argues that the First Amendment imposes meaningful limits on how government officials can restrict the ideas discussed on university campuses. In clear and accessible prose, he illuminates the legal status of academic freedom in the United States and shows how existing constitutional doctrine can be deployed to protect unbridled free inquiry.