German Empire
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Ernst Mayr
Kempten (Bavaria), German Empire
Archival Overview
German-American evolutionary biologist hailed as the 'Darwin of the 20th Century', who formulated the Biological Species Concept in 1942, proved allopatric speciation through geographic isolation, and authored 'Systematics and the Origin of Species'.
Biographical Record
Ernst Mayr (1904–2005) led daring ornithological expeditions into the interior of Dutch New Guinea and the Solomon Islands in the late 1920s, collecting 17,000 bird specimens and naming twenty-six new species. Observing that island birds diverged into distinct forms when separated by water barriers, he deduced how new species emerge.
In 1942, Mayr published 'Systematics and the Origin of Species', defining species not by morphological differences, but as 'groups of interbreeding natural populations that are reproductively isolated from other such groups'. His theories of allopatric speciation and founder effect revolutionized evolutionary systematics over an eighty-year career at Harvard.
Key Life Milestones
Formulation of the Biological Species Concept
Published 'Systematics and the Origin of Species', establishing reproductive isolation as the criterion for species.
Theory of Peripatric Speciation and the Founder Effect
Formulated how small peripheral populations undergo rapid genetic revolution into distinct new species.
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Final Resting Place
Perpetual MemorialCambridge (Massachusetts), United States