William Heath Davis (1822-1909) was the son of a Boston ship captain engaged in the Hawaiian trade and a Polynesian mother. He visited California twice on trading voyages before setting up business there in 1838. In 1845 he settled permanently in San Francisco, becoming one of the city's leading merchants. His marriage to María de Jesus Estudillo tied him to the Hispanic community in his adopted region. Seventy-five years in California (1929) is an expansion of Sixty years in California, a book Davis published in 1889. It is a history of California as well as the author's memoirs of his life through the mid 1850s with an emphasis on the transformation of Yerba Buena to San Francisco, the Gold Rush, and the imposition of United States power in California.