For many years, Diane Ravitch was among the country's leading conservative thinkers on education. The cure for what ailed the school system was clear, she believed: high-stakes standardized testing, national standards, accountability, competition, charters, and vouchers. Then Ravitch saw what happened when these ideas were put into practice and recanted her long-held views. The problem was not bad teachers or failing schools, as conservatives claimed, but poverty. She denounced privatization as a hoax that did not help students and that harmed the public school system. She urged action to address the root causes of inequality. In this intimate and timely memoir of her life's work as a historian and advocate, Ravitch traces her ideological evolution. She recounts her personal and intellectual journey: her childhood in Houston, her years among the New York intelligentsia, her service in government, and her leftward turn. Ravitch shares how she came to hold conservative views and why she eventually abandoned them, exploring her switch from championing standards-based curriculum and standardized testing to arguing for greater investment in professional teachers and in public schools. Bringing together candid reflections with decades of research on education, Ravitch makes a powerful case for becoming, as she calls herself, "an activist on behalf of public schools."