Tom Michael Fenchel (born March 19, 1940 in Copenhagen) is a Danish marine ecologist and professor first at the University of Aarhus, later at the University of Copenhagen. He is a highly cited scientist and known for, among other things, Fenchel's Law. He holds PhD (1964) and D.Sc. (1969) titles, both from the University of Copenhagen.
He is a foreign member of the Royal Society and a reviewing editor of the scientific journal Science. He was the 1986 recipient of the ECI Prize of ecology and wrote the book  in the ECI Prize laureate series Excellence in Ecology. He served as president 2004-2008 of the Royal Danish Academy of Sciences and Letters (he has been a member since 1976). In 2006 he was awarded the A.C. Redfield Lifetime Achievement Award by the American Society of Limnology and Oceanography.
He is a member of the Norwegian Academy of Science and Letters and of the American National Academy of Sciences
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