In the forty years since the publication of the special issue devoted to Chicano history in the Pacific Historical Review in 1973, the literature on Mexican Americans has flourished. In the early 1970s, the nascent subfield of Chicano history was established, and in subsequent decades it reached maturity as the number of historians writing in this area increased significantly, as did the number of monographs and articles. By the early twenty-first century, the importance of historical studies of Mexican Americans is reflected in the literature of many subfields of U.S. history—labor, women, U.S.-Mexican borderlands, urban, immigration—and in the curriculum of colleges and universities across the nation. This article provides a personal perspective on the origins, foundations, and maturation of Chicano history.