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Adrien Robert Gensoul (1823–1877) was a Parisian émigré who arrived in California in 1850 aboard the Medicis at age 27. Settling in San Francisco, he became a prominent book dealer and importer of fine goods, specializing in prints, photographs, and art supplies, while also operating as a frame manufacturer between approximately 1861 and 1865. Beyond his mercantile ventures, Gensoul was among the original investors in the Santa Cruz Island Company in 1869, joining nine others in a venture that sought to develop the island’s resources. His diverse business interests reflected the entrepreneurial spirit of early San Francisco.