Fink began his teaching profession at
Upper Iowa University in 1892 as Professor of Botany. In 1903 he was recruited to become Professor of Botany at
Grinnell College where he remained for three years. In 1906, Fink accepted the call from
Miami University to head up the Department of Botany. He remained at the University until his death in 1927. At this time, his interest in lichens began to take hold, leading him to author numerous research papers on the subject. Fink was a member of numerous scientific societies, including
Iowa Academy of Science (president),
American Association for the Advancement of Science,
Sigma Xi, and
Botanical Society of America, among others, oftentimes assuming leadership positions. Fink was never one to shy away from controversy. He was an early champion of Schwendener’s proposal that lichens were actually dual organisms, consisting of both algae and fungi. It was a very unpopular thesis in America at that time. He went on to develop and advocate a classification scheme that positioned lichens amidst the fungi that he believed were
parasitic on their
algal component. Fink was not content to merely study
lichen systematics and floristics, he was also absorbed with their ecology and physiology. His floristic studies are the ones for which the world now remembers him, especially his studies of Minnesota lichens and his "Lichen Flora of the United States" which was completed by his student Joyce Hedrick after his death. "Lichen Flora...", although difficult to exploit, is the only study for the United States that considers all lichen groups (1,578 species, varieties, and forms, belonging to 178 genera and 46 families). ==Views on tobacco==