Adrien Gensoul (1823-1877), emigrated from Paris, France to California in 1850 at the age of 27. Gensoul was a well-known San Francisco book dealer and importer of fine goods. He imported prints, photographs and art supplies, and was a frame manufacturer in San Francisco, active c. 1861- c. 1865.
Britton & Rey
Joseph Britton (1825 – July 18, 1901) was a lithographer, the co-founder of prominent San Francisco lithography studio Britton and Rey, and a civic leader in San Francisco, serving as a member of the Board of Supervisors and helping to draft a new city charter.
In 1852 he became active in lithography and publishing, first under the name Pollard and Britton, and then Britton and Rey, a printing company founded with his friend and eventual brother-in-law Jacques Joseph Rey. Britton and Rey became known as the premier lithographic and engraving studio of the Gold Rush era, producing letter sheets, maps, and artistic prints.