Gustavus Augustus Eisen (August 2, 1847 − October 29, 1940) was a Swedish-American polymath.
He came to California that same year to participate in a biotic survey sponsored by the Swedish Academy of Sciences.
[2] He was known to have diverse interests, including "art and art history, archeology and anthropology, agronomy and horticulture, history of science, geography and cartography, cytology, and protozoology, as well as marine invertebrate zoology" [1] A 2012 article in the San Francisco Chronicle describes him as, "One of those 19th century polymaths, Eisen also studied malaria-vector mosquitoes, founded a vineyard in Fresno, introduced avocados and Smyrna figs to California, campaigned to save the giant sequoias, and wrote a multivolume book about the Holy Grail."
[3] He is perhaps best known for his studies of oligochete worms and many species were named after him including those in the genus Eisenia.
[8] Earthworms Brown algae Vascular Plants Mosquitoes Ant Hymenoptera Grasshopper Copepods Zygoptera Tipulidae Diptera Spider Snake Fish