A student of G. Evelyn Hutchinson, MacArthur earned his Doctor of Philosophy from Yale University in 1958. His thesis was on the division of ecological niches among five warbler species in the conifer forests of Maine and Vermont.
MacArthur received his Bachelor"s degree in mathematics from Marlboro College, followed by a Master"s degree in mathematics from Brown University in 1953. MacArthur was a professor at the University of Pennsylvania, 1958-1965, and professor of biology at Princeton University, 1965-1972. He played an important role in the development of niche partitioning, and with East.O. Wilson he co-authored The Theory of Island Biogeography, a work which changed the field of biogeography, drove community ecology and led to the development of modern landscape ecology.
His emphasis on hypothesis testing helped change ecology from a primarily descriptive field into an experimental field, and drove the development of theoretical ecology.
At Princeton, MacArthur served as the general editor of the series Monographs in Population Biology, and helped to found the journal Theoretical Population Biology. He also wrote Geographical Ecology: Patterns in the Distribution of Species (1972).
He was elected to the National Academy of Sciences in 1969. Robert MacArthur died of renal cancer in 1972.
National Academy of Sciences.