src: Greenwell war Mitglied diverser wissenschaftlicher Organisationen, darunter die "American Society of Mammalogists", "Explorers Club" (New York) und der "Royal Geographical Society" (London).
tgt: A member of numerous scientific societies, including the American Society of Mammalogists, Greenwell was a Fellow of both the Explorers Club (New York) and the Royal Geographical Society (London).