He made systematic revisions of the taxonomy of the birds of Peru and their relatives in other parts of South America, and in his later years combined this with studies of New World flycatchers, preparing the section on the Tyrannidae for Peter's Check-list of Birds of the World.
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Zimmer is commemorated in the names of a number of animals, including Zimmer's Tapaculo Scytalopus zimmeri.
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John Todd Zimmer (Bridgeport, Ohio, February 28, 1889 – White Plains, New York, January 6, 1957) was a leading American ornithologist.
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