Mariano Guadalupe Vallejo (1807–90) grew up in Spanish California, became a leading military and political figure in Mexican California, and participated in some of the founding events of U.S. California. In 1874–75, Vallejo, working with historian and publisher Hubert Howe Bancroft, composed a five-volume history of Alta California—a monumental work that would be the most complete eyewitness account of California before the gold rush. But Bancroft shelved the work, and it has lain in the archives until its recent publication as Recuerdos: Historical and Personal Remembrances Relating to Alta California, 1769–1849, translated and edited by Rose Marie Beebe and Robert M. Senkewicz. In Mariano Guadalupe Vallejo: Life in Spanish, Mexican, and American California, Beebe and Senkewicz not only illuminate Vallejo’s life and history but also examine the broader experience of the nineteenth-century Californio community. In eight essays, the authors consider Spanish and Mexican rule in California, mission secularization, the rise of rancho culture, and the conflicts between settlers and Indigenous Californians, especially in the post-mission era. Vallejo was uniquely positioned to provide insight into early California’s foundation, and as a defender of culture and education among Mexican Californians, he also offered a rare perspective on the cultural life of the Mexican American community. In their final chapter, Beebe and Senkewicz include a significant portion of the correspondence between Vallejo and his wife, Francisca Benicia, for what it reveals about the effects of the American conquest on family and gender roles. A long-overdue in-depth look at one of the preeminent Mexican Americans in nineteenth-century California, Mariano Guadalupe Vallejo also provides an unprecedented view of the Mexican American experience during that transformative era.