Within the Democratic Party of the midcentury U.S., liberalism was channeled into social-democratic class politics, a broad commitment to generous social spending, and a style of market-managing economic governance known as “developmental liberalism.” However, as the essays in Mastery and Drift continue to reveal, liberalism’s professional-class makeover has colored not only mainstream Democratic politics but the full spectrum of left-liberal causes. Finally, in a closing essay that alchemizes insular academic debates between social and “institutional” history into a fascinating, occasionally caustic intellectual history of liberalism, Gabriel Winant contends that the rise of technocratic professional-class liberalism has even recast the historical profession itself.