Joseph Francis Charles Rock (1884-1962), or Joseph Rock, was a botanist, photographer, explorer, and linguist. He primarily studied plant species in Hawaii and China, both places of residence during his lifetime. Although Rock faced illness throughout his life and was never formally educated, he dedicated his life to substantial exploration and research, and documented his travels through photographs.
Rock was born in Vienna, Austria in 1884 and immigrated to the United States in 1905, residing in Hawaii from 1907-1920. During his time in Hawaii, he taught botany at the University of Hawaii and published numerous books and articles concerning the flora of the state. In 1920, he began his exploration of China under the U.S. Department of Agriculture, which would end up lasting 27 years. While in China, Rock extensively explored Tibet worked for institutions like Harvard University and National Geographic. On a 1924 Tibetan expedition encouraged by Charles S. Sargent, the first director of the Arnold Arboretum, Rock collected 20,000 herbarium specimens. While traveling Rock engaged with local cultures and languages, especially that of the Naxi people. Rock's travels are documented through his personal photographs—images that Rock believed to be important visual evidence of his research. In 1949, due to the political situation in China, he returned to Hawaii, where he passed away in 1962.