Arthur_D._Hasler
Arthur Davis Hasler (January 5, 1908 – March 23, 2001) was an ecologist who is credited with explaining the salmon's homing instinct. Hasler was a member of the National Academy of Sciences and the American Academy of Arts and Sciences. The New York Times called him "an internationally recognized authority on freshwater ecology". He served as President of The Ecological Society of America, which called him "one of the leading figures in 20th century freshwater ecology". Hasler pioneered a research method based on manipulation of entire lake ecosystems. This method became an instrumental new tool for ecology. He published over 200 scientific papers, was an author or an editor of 7 books, and supervisor of 52 doctoral degrees.