Mark Twain’s Letters, Volume 1, 1853–1866 inaugurates the comprehensive edition of Samuel Clemens’s correspondence, tracing his transformation from an ambitious journeyman printer into the writer who would become Mark Twain. This first volume gathers letters from Twain’s early travels across the United States and his formative years in Nevada and California, culminating in the period just before the publication of The Celebrated Jumping Frog of Calaveras County. The correspondence captures his wit, irreverence, and sharp eye for character, while also offering candid glimpses of his personal struggles, ambitions, and relationships with family and friends. Edited with full annotation, the letters are accompanied by contextual notes that illuminate Twain’s cultural milieu and clarify references to people, events, and places central to his development. They reveal the interplay between Twain’s lived experiences—riverboat piloting, mining, and reporting—and his growing literary voice. Together, these documents chronicle the apprenticeship of an American humorist while enriching our understanding of the social and cultural world of mid-nineteenth-century America. This first volume is indispensable to scholars and general readers alike, presenting the raw material of a life that would reshape American literature.